I have Windows 7 Ultimate 64 bit on my PC. I just installed "Microsoft Security Essentials" anti virus on my PC as it was required. During its installation I read that this anti virus regularly scans and checks whether the Windows on one's PC is genuine and if found non-genuine it would lock the operating system. I don't know whether the Windows on my PC is genuine or not and also I don't want to take this risk because I have many important things on my PC. So I am asking you whether whatever I have read is correct? And is it really risky to have "MSE" anti virus on my PC? Please inform if it is risky and does what I have read. Also suggest me some other good anti virus if that is the case. Thanks in advance for your help and with my best regards.