I've got an Athlon 1800 w/ 512 mb running Windows XP. 2 80gb 7200 rpm drives (Seagate/WD). Lately the system has really slowed down. All it's mainly used for is intenet & downloading, but it seems to be taxed all the time, even if I'm just opening a folder or browsing w/ Firefox. I hear my hard drives making noise all the time despite regular defrags. I've run AdAware, Spybot, and EZ Antivirus and got rid of some things initially, but the system is just as slow now that it checks out clean. I usually have MSN, AIM, EZ Antivirus and Epson Status Monitor running. I'm going to remove the latter 2 from startup and see if that helps any, but it's been gradually slowing down since before I installed either of them. The computer runs like it has a huge memory leak even with no programs running. I don't get it. How can I determine what's causing the problem?