Hi guys, have you ever experienced this problem? Yes, i think this is my problem too. Okay, i have search this from xda developer android forum and i found the solution.
First, i want to share my problem to you. My HH is sony ericsson xperia pro. Sometimes, i have no problem installing some applications. But, after many times i want to download application from google play store, i cant download it. It has showing a message "[App Name] could not downloaded due to an error. (403)".

After i had search this message to forum, here the result.

He/She said guys CMIIW error 403 is a problem with proxy my sugestions is try restore the old default apn and clear the proxy in setting save and reboot hope it will work.

Ok, this is step by step for implement their opinion :

1. In the home screen, press "Setting ~> Wireless & networks ~> Mobile networks"
   
   
2. Select Access Point Names ~> then select your APN's setting. (example : my APN is 3 WAP)
3. Make sure your Proxy in APN setting is (clear proxy setting)
   
   
   
4. Done!!!

In some handsets if the problem still persists

do the same procedure and at
Acess Point Names
(Remember that this is only after following the above steps and rebooting the device)
Reset to Default 

These originally info i got from 

Finnally, again i say very-very sorry for my bad english.. :D But sometimes, i believe that i can speak and write english clearly. Thanks for your attendance. I'm very appreciate for your suggestion. 

FaNz'S blog.. just shared anything in my mind.. ^-^

refference link : http://forum.xda-developers.com/showthread.php?t=1567456&page=3

Time to share again and again from my mind. He he he.. Sorry for my bad english. Ya namanya juga masih belajar cuma bermodalkan nekat dan nulis di blog sendiri juga. :p (Yes, i'm still learning and just capitalize reckless then write on my own blog. :p). In this time, i will to explain you "How to Create Chat Box in the Upper Right Corner". Base on my experience, cieee experience meni gaya.. wkwkwkw. Lets get started

1. First, add this code to gadget HTML/Javascript in the blogger.

<style type="text/css">
#gb{
   position:fixed;
   top:50px;
   z-index:+1000;
}
* html #gb{position:relative;}

.gbtab{
   height:100px;
   width:30px;
   float:left;
   cursor:pointer;
   background:url('http://lh4.ggpht.com/_jn57XA2jLxY/SmCHl1YEsxI/AAAAAAAAAXQ/HshHClEVcvY/tabs.png') no-repeat;
}
.gbcontent{
   float:left;
   border:2px solid #A5BD51;
   background:#F5F5F5;
   padding:10px;
}
</style>

<script type="text/javascript">
   function showHideGB(){
      var gb = document.getElementById("gb");
      var w = gb.offsetWidth;
      gb.opened ? moveGB(0, 30-w) : moveGB(20-w, 0);
      gb.opened = !gb.opened;
   }
   function moveGB(x0, xf){
      var gb = document.getElementById("gb");
      var dx = Math.abs(x0-xf) > 10 ? 5 : 1;
      var dir = xf>x0 ? 1 : -1;
      var x = x0 + dx * dir;
      gb.style.right = x.toString() + "px";
      if(x0!=xf){setTimeout("moveGB("+x+", "+xf+")", 10);}
   }
</script>

<div id="gb">

<div class="gbtab" onclick="showHideGB()"> </div>

<div class="gbcontent">

<!-- your Chat Box HERE -->

<!-- end Chat Box -->

<script type="text/javascript">
var gb = document.getElementById("gb");
gb.style.right = (30-gb.offsetWidth).toString() + "px";
</script></div></div>

2. Second step, you are create your own Chat Box. For example : check this link
http://www.cbox.ws/
Just sign up, then get your free Cbox.

After you get the code, then paste into the code above after your Chat Box HERE before end Chat Box. Tralalaaa, your own CBox in the upper right Corner just created. Waduh, parah pisan bahasa inggris nya. Kalo ada yang bisa review postingan blog ini dan ngasih saran untuk kata-kata yang lebih baik, saya akan sangat appreciate sekali dengan anda. Cukup email kan atau komentar dibawah. Mari kita belajar sama-sama, saya ada ilmu lebih kita bagikan dan pelajari sama-sama, Anda ada info mari kita rundingkan bersama-sama juga. :)

This is useful shortcut for Visual Studio 2010. Yes, sangat berguna sekali teman-teman. Terutama  bagi yang sedang mendevelop aplikasi asp.net, c#, dan lain-lain. Copas juga sih, tapi apa salahnya juga kalau saya berbagi pengalaman. Karena ilmu itu semakin bertambah jika kita memberikannya pada orang lain.

Ok, kita langsung saja berikut ini adalah shortcut-shortcut yang bisa digunakan di Ms Visual Studio 2010. Check this out. ^-^

1. Manage Visual Studio
Ctrl+s	Save current file
Ctrl+Shift+s	Save all files
Ctrl+Shift+n	Create new project
Ctrl+o	Open file
Ctrl+Shift+o	Open project
Ctrl+Shift+a	Add item to project
Esc	Close menu or dialog
Ctrl+p	Print
Shift+Alt+Enter	Toggle full screen mode
Ctrl+f4	Close current tab
Ctrl+f6/Ctrl+Shift+f6	Go to next / go to previous window
Ctrl+Tab, then Arrow keys	Press and hold Ctrl+Tab, then using arrow keys gives a small task manager with all open files and views

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2. Bookmarks
For keystrokes with two keys such as Ctrl+k+k, keep holding the Ctrl key until releasing the last key.
Ctrl+k+k	Toogle bookmark
Ctrl+k+n	Goto next bookmark
Ctrl+k+p	Goto previous bookmark
Ctrl+Shift+k+n	Goto next bookmark in folder
Ctrl+Shift+k+p	Goto previous bookmark in folder
Ctrl+k+w	Put focus on bookmark window
Esc	Leave bookmark window and focus on editor
Ctrl+k+h	Toggle code shortcut at current line*
Ctrl + K + L	Clear all bookmarks
*if somebody figures out additional shortut keys on how to use code shortcuts, please edit this page and add.

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3. Code Editor

Find, Replace, and Goto
Ctrl+f	Find and replace dialog box
f3/Shift+f3	Find next / find previous
Ctrl+h	Display Replace options on the quick tab
Shift+f12	Find all references for selected symbol
Ctrl+Shift+f	Find in files
Alt+F3, s	Stop current find in files operation
Ctrl+F3/Ctrl+Shift+f3	Find next / find previous in selected text
Alt+F12	Find symbol
Ctrl+d	Put cursor in find/command box of the toolbar. Use ctrl+/ in Visual C#
Ctrl+i/Ctrl+Shift+i	Incremental search / reverse incremental search
Shift+Alt+f12	Quick find symbol
Ctrl+,	Display Navigate-To dialog box
Ctrl+g	Goto line number
Ctrl+]	Go to matching brace in source file

Undo, Redo, Copy, Paste
Ctrl+x, Ctrl+x, Ctrl+v	Cut, copy, paste
Ctrl+Shift+v	Pastes an item from the Clipboard ring
Ctrl+z	Undo
Ctrl+y	Redo (or Shift+Alt+Backspace, or Ctrl+Shift+Z)

Select Text
Shift+Arrow Keys	Extend selection one character/one line
Ctrl+Shift+End/Ctrl+Shift+Home	Extend selection to end / to beginning of document
Ctrl+Shift+]	Extend selection to nexst brace
Shift+End/ Shift+Home	Extend selection to end / to beginning of line
Shift+Page Down/Shift+Page Up	Extends selection down one page / up one page
Ctrl+w	Select current word
Esc	Cancel Selection
Ctrl+Shift+Page Down/Page Up	Moves cursor and extend selection to the last line / first line in view.
Ctrl+Shift+Arrow right/arrow left	Extend selection one word to the right / one word to the left
Ctrl+a	Select All

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4. Coding

Collapse Items
Ctrl+m+m	Collapse / un-collapse current preset area (e.g. method)
Ctrl+m+h	Collpase / hide current selection
Ctrl+m+o	Collapse declaration bodies
Ctrl+m+a	Collapse all
Ctrl+m+x	Uncollapse all
Ctrl+m, ctrl+t	Collapse Html tag

Edit Code
Ctrl+l	Delete current line or selection of lines to and add to clipboard
Ctrl+Shift+l	Delete current line or selection of lines
Ctrl+Delete	Delete word to right of cursor
Ctrl+Backspace	Delete word to left of cursor
Ctrl+Enter	Enter blank line above cursor
Ctrl+Shift+Enter	Enter blank line below cursor
Ctrl+Shift+u	Make uppercase
Ctrl+u	Make lowercase (reverse upercase)
Ctrl+k+c	Comment selected text
Ctrl+k+u	Uncomment selected text
Ctrl+k+\	Remove white space and tabs in selection or around current cursor position
Ctrl+k+d	Format document to code formatting settings
Ctrl+k+f	Format selection to code formatting settings
Ctrl+Shift+space	Display parameter required for selected method
Ctrl+Shift+8	Visualize whitespace (or press Ctrl+r, then Ctrl+w)
Ctrl+k+d	Format document to code formatting settings
Ctrl+k+f	Format selection to code formatting settings
Ctrl+Shift+t	Transpose word to right of cursor; makes b=a out of a=b if cursor was in front of a
Ctrl+t	Transpose character left and right of cursor; cursor between ab would make ba
Shift+Alt+t	Transpose line: Move line below cursor up and current line down.

IntelliSense and Code Helper
Ctrl+Space	Autocomplete word from completion list (or alt+right arrow)
Ctrl+Shift+Space	Show parameter info
Ctrl+f12	Display symbol definition
f12	Display symbol declaration
Ctrl+j	Open IntelliSense completion list

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5. Build and Debug
f7	Build solution (or Ctrl+shift+b)
Ctrl+Alt+f7	Rebuild solution
Ctrl+break	Cancel build process
Ctrl+\+e	Show error list
f9	Toggle breakpoint
Ctrl+b	Insert new function breakpoint
f5	Start debugging
f11	Debug / step into
f10	Debug / step over
Shift+f11	Debug / step out
Ctrl+f10	Debug / run to cursor
Ctrl+Alt+q	Show Quickwatch window
Ctrl+Shift+f10	Set current statement to be the next executed
Alt+* (on numeric keyboard)	Show nexst statement
Ctrl+Alt+e	Show Exception dialog box
Ctrl+f11	Toggle between disassembly and user code view
Shift+f5	Stop Debugging
Ctrl+f5	Bypass debugger
Ctrl+Alt+p	Show attach to process window
Ctrl+Alt+break	Break all executing threads

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6. Tool Windows
Ctrl+/	Put cursor in the find/command box in toolbar
Ctrl+k+b	Open code snippet manager window
Alt+f11	Open macro IDE window
Ctrl+k+w	Open bookmark window
Ctrl+Alt+k	Open call hierarchy window
Ctrl+Shift+c	Open class view window
Ctrl+Alt+a	Open Command window
Ctrl+Shift+o	Open Output window
Ctrl+Shift+e	Open Resource view window
Ctrl+Alt+s	Open Server explorer window
Ctrl+Shift+l	Open Solution explorer window
Shift+Esc	Close Find & Replace Window

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sumber :

http://www.shortcutworld.com/en/win/Visual-Studio_2010.html