Well, basically, I'm using a Dell Dimension 4550 on Windows XP Home(Yeah, I know, old as hell) and I'm a huge computer n00b. Someone told me that I should get a new Hard Disk Drive? I've been searching forums, but I don't know what hard drive I should get and if it's compatible with my computer or not. Help would be extremely appreciated, since I literally have less than 500MB left out of 74.4GB. Thanks in advanced!