When I try to connect to a server CS freezes

[HelpPlease]

When I click on a server it says "Establishing network connection to server..."
Then it doesn't load
It stays like that and freezes and won't let me connect to any server...
I have to CTRL + ALT + DEL to get it down.
Here are my specs:

   Operating System: Windows Vista™ Home Premium (6.0, Build 6000) (6000.vista_gdr.080917-1612)
           Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.                
       System Model: Dell DXP061                  
               BIOS: Phoenix ROM BIOS PLUS Version 1.10 2.3.1 
          Processor: Intel(R) Core(TM)2 CPU          6300  @ 1.86GHz (2 CPUs), ~1.9GHz
             Memory: 2046MB RAM
          Page File: 1446MB used, 2860MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 10
DX Setup Parameters: Not found
     DxDiag Version: 6.00.6000.16386 32bit Unicode

Thanks!

[textrex]

i think a new computer i needed

if not i had this problem i reinstalled steam and defraged then disk clean up and worked fine...
if not system format :/

[textrex]

i formated mines 4 days later problem never came up again

[Mr.Bob]

Restart the computer.

[rbo4o4]

activate administrator account. delete your current user account, restart and setup a new user account.

[carlobee]

i guess it needs a reformat.

[Mr.Bob]

No, Vista just hates Steam, or maybe Steam hates Vista. Either way it's more or less something we all get to live with for now. Some have found that deleting the download program Vista uses helps. IDK, search the forums here and you'll see the posts.