I had this problem 2 days ago, I dont know where I got this. I had a Norton anti-virus 2011 and it detected it but the problem is that it can't remove the virus, so I tried downloading the Norton 360(trial version) and it uninstalled my previous norton anti-virus and managed to find not just boot.tidserv but also other viruses that is a high risk and one of the viruses is named backdoor.tidserv . Norton 360 managed to quarantine the viruses and removed the boot.tidserv, but everytime I reboot, the virus pops up again saying "VIRUS REMOVE FAILED", but then when I click rescan it manage to remove boot.tidserv. My question is, did the virus totally disappeared? or do I still need to do something about it?