I have a Dell E521, Windows Vista, 2 GB RAM, AMD Athlon 63 3500+, NVidia GEForce 7300 LE. Since I got my computer it has been randomly freezing, I'm talking at as random as times as you can get. I have ran all the diagnostic tools that Dell told me to do at their web site, but still no go. Now things are starting to get worse as of the past couple days. Whenever I start my computer, it won't go past the opening screen (with the big Dell logo and the BIOS number). I have to do a hard shut down for it to start properly. also, a few little things, like after my computer starts, I will right click on something in the taskbar, and nothing will happen until about 10 minutes later, where a menu will pop up in the middle of the screen from what i right-clicked 10 minutes before. Also Windows Media Player is telling me that "Media sharing is currently diabled, either because the sharing service is not running, or your firewall settings have been changed. To restart sharing, you must first...