I had NIS that I bought for 4-5 years with my XP and with this new computer (Win 7) just got it through comcast ..the year free one..but dont' think you can use just the virus protector, worth a try though. I don't believe in a single security program for protection however. I also have a host file and use firefox with adblocker and noscript. Good luck on whichever one you pick and someone mentioned you need to adjust most you have. I did some minor adjustments on NIS to tell it what I liked.
PS Never had the problems with it you mentioned. Hopefully that doesn't mean you have malware