My 3 month old system (Windows XP) has been considerably slower these past two weeks or so, and I've done things like clearing out the caches, and turning off all the fancy visual effects. Since it's still annoyingly slow, I suspect that malware may be the cause, and so I was just wondering what everyone else uses to get rid of spyware/viruses/etc. Does it work well? Is it easy to use? I already have a program called Avast, but I think it just takes care of viruses, and doesn't consider other bad things that may be lurking.