My OS is win 7 Prof 64 bit and I have Microsoft Security Essentials and Anti Malware protecting my pc. I am not sure whether these two will do the job or preventing any intrusions into my pc. Therefore I am thinking of having zone alarm too. i know the norm is only to have one software for the job, but I have an aweful feeling that someone has hacked into my pc, and I do not know how to find out if this is true or not. perhaps the experts can advise. Thank u.