Please
Help us to Help you In order to help fully we need more information....
- What OS are you using? is it up to date?
- avast! version and VPS file (virus database) number, e.g. 0436-4 (see about avast!)
- What was the filename, where was it found
example (C:\windows\system32\infected-filename.xxx)?
- What actions have you taken to try and resolve the problem?
Also see this thread for further information and advice
User's FAQ.
There is also something else on your system that is reactivating the file, check out these other links
Advice & Tools for virus/trojan/malware Removal & Prevention and Eddy's HiJackThis Info and Analysis page,
HiJackThis log file analyzer and follow the directions there and get back to us if you need more help....