Recently I purchased this product. The Installation was no problem. I am running my pc with genuine Window 7 Ultimate for the past two years. This Mcafee Antivirus Plus, made my PC crashed within a week time. Being a genuine window 7 ultimate software, I reinstalled IT & downloaded updates from Micro software sites. After that i tried to install Mcafee antivirus with my registered serial number. Not accepting it. Also, I am having 25 digit activation code of Mcafee antivirus plus. No use. It was a waste of money, also my precious time & effort.