So after 1.24 patch I get the famous "unable to validate game version message". Tried formatting the comp., reinstalling , scanning for viruses and all the stuff from similar posts. Have no router, firewall is off, running on administrator, Xp , have no peer guard or similar programs. Here's the log :

------------------------------------------------------------------
System Overview
------------------------------------------------------------------
User : aaaaaaaa
Computer Name : AAAA-6445965F9F
System Directory : C:\WINDOWS\system32
Windows Directory : C:\WINDOWS
Operating System : 5.1 (Windows XP)
OS Build : 2600
Platform ID : 2
Service Pack : Service Pack 2
Service Pack Version : 2.0
Product Suites : Remote Desktop (Single),
Platform Type : Workstation
Physical Memory Usage : 57%
Total Physical Memory : 536330240
Total Virtual Memory : 2147352576
Page File Size : 1310666752
Available Physical Memory : 225370112
Available Virtual Memory : 2133602304
Available Page File : 734031872



------------------------------------------------------------------
Processor Information
------------------------------------------------------------------
Processors : 1
Processor Architecture : x86 (Intel)
Processor Family : Pentium
Page Size : 4096
Min. Memory Address : 65536
Max. Memory Address : 2147418111
3D Now! : Yes
MMX : Yes
SSE3 : No
SSE2 : No
SSE : Yes
Channels : No
Soft. Float Emulation : No
DEP Enabled : No
PAE Enabled : No



------------------------------------------------------------------
Process Snapshot
------------------------------------------------------------------
[System Process]
System
smss.exe
csrss.exe
winlogon.exe
services.exe
lsass.exe
svchost.exe
svchost.exe
svchost.exe
svchost.exe
spoolsv.exe
explorer.exe
daemon.exe
reader_s.exe
rundll32.exe
soundman.exe
Skype.exe
reader_s.exe
msmsgs.exe
nvsvc32.exe
wdfmgr.exe
alg.exe
wscntfy.exe
svchost.exe
svchost.exe
svchost.exe
svchost.exe
wuauclt.exe
svchost.exe
svchost.exe
svchost.exe
bittorrent.exe
svchost.exe
svchost.exe
svchost.exe
svchost.exe
svchost.exe
svchost.exe
firefox.exe
winamp.exe
BnetDiagTool.exe



------------------------------------------------------------------
Application Log
------------------------------------------------------------------
Running version 2.2

+++ Begin application initialization.
Initializing console...
Assigning console control handler...
Loading the Winsock library...
Initialization complete.

+++ Begin hostname resolution on europe.battle.net
Querying information about the host...
Hostname successfully resolved, displaying results...
213.248.106.68
213.248.106.200
213.248.106.201
213.248.106.202
213.248.106.204
213.248.106.65
213.248.106.66
213.248.106.67

+++ Begin connection test with all servers on asia.battle.net

+++ Begin hostname resolution on asia.battle.net
Querying information about the host...
Hostname successfully resolved, displaying results...
211.233.0.72
211.233.0.73
211.233.0.74
211.233.0.75
211.233.0.76
211.233.0.78
211.233.0.79
211.233.0.80
211.233.0.49
211.233.0.50
211.233.0.51
211.233.0.52
211.233.0.53
211.233.0.54
211.233.0.55
211.233.0.56
211.233.0.57
211.233.0.58
211.233.0.59
211.233.0.60
211.233.0.61
211.233.0.62
211.233.0.63
211.233.0.64

+++ Begin connection test with Battle.net server 211.233.0.72
Creating socket...
Binding socket to any available address...
Placing socket into asynchronous mode...
Initiating connection...
Attempting to establish a connection with the server...
Connection established with the server, determining if user is banned...



Tried all the servers, but can never go further than this message : "Connection established with the server, determining if user is banned..."

Perhaps you were one of those unlucky enough to get slapped with a completely random ban due to the patch release.

Yeah could be the case :/

... You aren't banned. Are you running Windows Vista? If so, make sure you're running in administrative mode. If not, take a look at the thread below for more information. Also, be sure to follow all steps provided:
(http://forums.battle.net/thread.html?topicId=10863439023).
Also, see this Support link below:
(http://us.blizzard.com/support/article.xml?articleId=20846).

I'm running XP :/ok i'll check those links .

So I found a keylogger and some viruses, maybe that was the source of the problem. So i cleaned all the viruses , also the Frozen Throne.exe witch was also infected, then checked for spyware and adware with some scanner and finally reformatted my computer, but still get the same message, though the viruses are gone.

Alright, try doing a fresh install using the Digital Downloads. Here's how to do it:
1) Create and verify a new Blizzard Account, if you don't have one already:
(https://www.blizzard.com/account/).
2) After logging in, click on "Games" under My Account Controls. Or, click here:
(https://www.blizzard.com/account/management/games.xml).
3) Click the Add a New Game button. Or click this:
(https://www.blizzard.com/account/management/add-game.xml).
4) Enter your CD-Key and select your language, when prompted.
5) You can now download the game by clicking the Windows or Apple logos, depending on your OS.
6) Install using the Game Key shown by clicking "[View Game Key]".

So I managed to solve the problem. It was caused by some spyware or a key loger, which I managed to remove using an online scaner : http://onecare.live.com/site/en-us/default.htm
Thanks for support guys ;]