My computer (Windows XP, Toshiba laptop) has been running very slowly. I ran AdAware and Spybot and they both found stuff and quarantined it. My computer still ran slow. I mean, real slow. I cleaned out the temp files and such and it still is slow. I can barely open anything and it takes about 15 minutes to start up. I ran Disk Defragmenter and I didn't have enough free space. I trashed a lot of stuff and got it to 18% free space but it could barely run and after over 24 hours and still sitting at 24% complete, I gave up. I ran a few online virus scanners and they have found nothing. I am willing to buy anti-virus software but I don't even know if it will fix this problem. I just don't know what to do. Yes, my computer is almost 4 years old but it was fine a week or so ago. I tried to System Restore but the last point is now yesterday. Oh, I did get a message yesterday saying there was an Intrusion Alert. I ran the programs again (virus scanners, spyware destroyers) and they still show nothing. Anyway, if someone can help, I'd appreciate it.