I am using this for Windows 8. But issue is that Don’t buy from the seller from which I bought.The CD was not working at all. I had to download it from their site. Also its costly here. You can get it for 400 in market.
FYI, I am still using Net Protector with no problems at all. I use them on 3 PCs and 2 laptops and will use continue to use it. I don’t know what the problem is in your PC. It was introduced to me by a pal of mine in 2011 and I thank him. Not only it is cheap, it is a very effective antivirus software. So why should I buy, say, Quickheal or Norton, etc.?