Infected with Sality virus

I was using Nod32 4 always but for some reasons my computer in the past few weeks had no antivirus as i did a re-installation of the windows and my computer engineer installed Avira antivirus , and few days ago i inserted a usb flash and it infected the PC with win32/sality.nau virus
i reformated the C and reinstalled windows XP
i installed Nod32 4 and updated it
I scanned my other hard partitions and it cleaned hundreds of infected .exe with this virus
the problem is many of these files are install/setup files for my used programs and many of them after it was cleaned and the virus moved to quarantine seems to be corrupted as some give me NSIS error when i try to install it and some install files as zip self-extractors says " win self-extractor header corrupted"
i didn't try all of them but these are some errors and also some still works fine

Why these files are damaged? is it error in cleaning?
if i restored them and cleaned with another antivirus will it be solved?
or they are damaged forever?

 

No need to worry. Been down this road before. Malwarebytes will fix it.

http://www.bleepingcomputer.com/download/malwarebytes-anti-malware/?1

 

but what i do now? do i restore the virus from quarantine or not ? as files now is corrupted after cleaning with nod32

 

If files are non-functional after cleaning, it's usually because the virus infected them improperly and removed or overwrote important information necessary for repairing a file to a functional state. I'd suggest submitting such a file to ESET as per the instructions here, ideally along with an original (clean) version of the file.

 

So this files are permanently damaged after cleaning?

 

Without sending the file to ESET and analyzing it, it's impossible to tell.

 

It's a shame there is no stand-alone cleaner for Win32Sality

 

Sality is a file infector which changes quite often. Several modules are required for proper detection and cleaning, updated on a regular basis. What you're basically missing is a package containing ecls.exe with all other current modules. However, it's possible to install a trial version of an ESET product and take the modules along with ecls.exe to an infected computer to clean it.

 

Noted and thank you for the feedback.