I feel your pain, actually everybody's groans going through hours of scanning with or without tech support from Jack Daniels.
Some of you on the board are describing what may be a rootkit, which is a category of particularly bad malware. http://en.wikipedia.org/wiki/Rootkit
Unfortunately many rootkits are so devious (intelligent), they can hide from NAV, McAfee and the other mainstream anti-vir programs, even re-naming themselves to avoid detection.
Long story short, two progs (below) helped pinpoint the problems, but I still had to go through several directories and the Registry to manually delete files and keys.
http://support.kaspersky.com/viruses/solutions > TDSSKiller Fast, specialized scan. Installation not necessary. Good idea to rename TDSSKiller.exe to anything you like - gofishing.exe, dilutionsux.exe, etc. - to avoid the possibility of a rootkit smart enough to recognize the prog.