Windows XP sp3 Home trojan problems...

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I recently retrieved my old computer which I had loaned to my brother. I used Avast antivirus and removed about 3 viruses (trojans) which had taken root. Since then, I recieve the message "This application has failed to start because msuhtudgbvo.dll was not found. Re-installing the application may fix this problem." for every application I try and launch.

Now, I have had missing DLL's in the past and simply googled them and got the file again. However, when i google for the msuhtudgbvo.dll I get nothing, no results period, which I find odd.

Since the time of finding the virus, I have also downloaded and scanned with several other scans, including Mal-Ware Bytes and Super-Spyware scanner, which have netted zero results.

Any help on this would be appreciated, since even though the computer runs the pop-up is way annoying.

Thanks,

Psych