I was browsing the web for lyrics to a song, I opened a site, and all of the sudden a download window comes up in firefox (I forget which site, I closed everything very fast.) it downloads a file default.exe to my desktop, I scanned it with AVG, nothing, so I deleted it (Stupid I know, I should have kept it for analysis.) anyways, this was all after AVG warned me of a Downloader.VB.R trojan horse, so I scanned my PC with AVG, found it, and it now resides in the virus vault, I then scanned with AntiVir PE, and eScans antivirus utility, they found nothing, I scanned with Ewido Security Suite and a2 they found nothing as well, then scanned with adaware and spybot s&d and they found nothing, I am wondering if I should asusme that my PC is clean or not? The infected file was found in Firefox's browser cache folder, but after scanning with everything I have, nothing was found, I checked auto start entries, and nothing has been added, and I checked all services (In the service control panel) and nothing, I am wondering also if it is ok to put a Hijack This log up? - But mostly I want to make sure that my PC is clean.