Lot's of problems. Please help. Thanks

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I'm running on Win XP SP3, and lately i had lot's of problems with my computer. I have error messages when I start Windows

• Download and install the WGA Diagnostic Tool:
  http://go.microsoft.com/fwlink/?linkid=56062
• Click Run and Run again
• Click Continue, click Copy
• Next open Notepad, in the empty pane right click and select Paste

• Wga results.txt
• New HJT log
• Information on errors received

So, I've unistalled Microsoft Office.

Spybot - Search & Destroy

• Download random's system information tool (RSIT) by random/random from here and save it to your desktop.
• Double click on RSIT.exe to run RSIT.
• Click Continue at the disclaimer screen.
• Once it has finished, two logs will open. Please post the contents of both log.txt (<<will be maximized) and info.txt (<<will be minimized)

• CKFiles.txt
• MBAM log
• RSIT logs ( info.txt and log.txt)
  

Your System is infected with Virut!!
Virut is a file infecting virus which is able to modify itself each and every time it runs. In addition, when it infects, sometimes it will destroy the file it tries to latch onto.
For these reasons, you really can't truly fix Virut. You will need to format/reinstall the operating system on this machine.

More information:
http://free.avg.com/66558

There are bugs in the viral code. When the virus produces infected files, it also creates non-functional files that also contain the virus.

http://home.mcafee.com/VirusInfo/VirusProfile.aspx?key=143034

W32/Virut.h is a polymorphic, entry point obscuring (EPO) file infector with IRC bot functionality. It can accept commands to download other malware on the compromised machine.
It appends to the end of the last section of executable (PE) files an encrypted copy of its code. The decryptor is polymorphic and can be located either:
Immediately before the encrypted code at the end of the last section
At the end of the code section of the infected host in 'slack-space' (assuming there is any)
At the original entry point of the host (overwriting the original host code)

Miekiemoes, an expert for malware removal, and an MS-MVP, additionally [url=http://miekiemoes.blogspot.com/2009/02/virut-and-other-file-infectors-throwing.html:1mt4rz61]has a blog post about Virut.

I suggest you to start backup all of your valuable data/documents/pictures/movies/songs/etc..
Do NOT backup any applications/installers and Do NOT backup any .exe/.scr/.htm/.html/.xml/.zip/.rar files...
This because these files may be infected as well. If you back them up and replace them afterwards, it will infect your computer again.

Read here for instructions how to format and reinstall Windows:

http://web.mit.edu/ist/products/winxp/advanced/reinstall-format.html

These are really bad news. Anyway, thanks very much for your help.

Just one last request. Can you tell me what should I do to prevent this happening again? ... programs to install, etc...

• Hosts File:
  A Hosts file is like a phone book. You look up someone's name in the phone book before calling him/her. Similarly, your PC will look up the website's IP address before you can view the website.
  
  Hosts file will replace your current Hosts file with another one containing well-known advertisement sites, spyware sites and other bad sites. This new Hosts file will protect you by re-directing these bad sites to 127.0.0.1.
  
  Here are some Hosts files:
  
• MVPS Hosts File
• Bluetack's Hosts File
• Bluetack's Host Manager
• hpHosts.

1. Never open email attachments, not even if they are from someone you know. If you need to open them, scan them with your antivirus program before opening.
2. Never open emails from unknown senders.
3. Beware of emails that warn about viruses that are spreading, especially those from antivirus vendors. These email addresses can be easily spoofed. Check the antivirus vendor websites to be sure.
4. Be careful of what you download. Only download files from known sources. Also, avoid cracked programs. If you need a particular program that costs too much for you, try finding free alternatives on Sourceforge or Pricelessware.