Over the past years, I have noticed my PC progressively slowing down. Now it has come to the point where it has trouble correctly playing videos and games tend to run slow on it. I use a Pentium 4 processor with 512 Mb RAM. The videos that I am playing did not have trouble in the past, but are having increasing trouble now. Furthermore, my computer seems to be slow occasionally when playing streaming video and flash stuff. Also, games run slower, and the games I am using are older games, such as Playstation games (it's legal since I am using CDs that I bought). I think some happen to my drives when I tried to make changes to my computer, which made everything slow, includding processing on the desktop. Things have improved a bit since I bought Speedupmypc, but not enough. I do not have my Windows CD since I am studying abroad and won't be able to reinstall till I get back home, and restore points always fail on my computer. First, how do I check to see if there is actual problems with my drives and cards? Second, how do I fix it? All help will be appreciated. Thank you.