Another problem is when you use an anti-virus program from one mfgr, anti-spywear from another and a fire wall from a third, and for instance, they often interfere with each other. I use Norton’s 360. Its light on system resources, works well, is easy to set up, includes a utility to remove temp and other garbage file, and has a defragger that works far faster and easier than the one built into Windows. Its back-up utility is poor because it doesn’t allow for an emergency boot disk in case your system is so badly messed up, you can’t even boot your system. It’s not free, but like I said, it’s a high quality security suite written by professional developers, who expect to be paid for their work.