C:\XP:\dotnetfx\setupdb.dll
upload suspicious file(s) to www.virustotal.com and test with 40+ malware scanners when you have the result, copy the url in the address bar and post it here for us to see

alternative
Jotti http://virusscan.jotti.org/en
VirSCAN http://virscan.org/
Metascan http://www.metascan-online.com/