Im planning to build a new system but I want to keep my old hard drive which has anti-virus installed and windows xp installed. I am gong to have 2 hard drive: one is going to a freshly installed windows 7 and one is the old one( windows xp). If I installed an anti-virus in the new hard drive which is windows 7, will it conflicts with the anti-virus installed on windows xp? I will be booting from windows 7.
so you mean when I run on windows 7, the anti-virus in the another hard drive( windows xp ) will not be activited? So a anti- virus on windows 7 is mandotary?
Absoutely necessary - when the system is running, XP is not so the AV installed in XP cannot possibly operate. Microsoft Security Essentials is surprisngly effectual, free from the M$ website and easy to configure.