Before "getting out" of Windows, I found some excellent "free-ware" for windows, they work great, and either they are "free completely", or you can get a "free version" that wants you to buy the "buy" version, but still doesnt lock up after a "trial" period...

Spy-Ware -=- Spybot Search and Destroy - free-ware...

Anti-Virus -=- AVast -=- "Home" version is free-ware, but always tells you that "if you bought the real version, you'd get xxxxxxxx features...". It doesnt lock up or anything, it just advertises for its "paid" version....

Spybot is excellent, it has "ripped out" tons of junk that gets "added" into IE all the time... Nice thing is, both run "native" in Windows...