I use my computer about 10-12 hours a day. Lately at least once a day I get the blue screen saying error and so on. I have also been having trouble with my mouse being jerky in motion on the screen and my keyboard won't keep up with my typing or sometimes won't type at all, and I'm not a fast typer. My mouse is optical, so it's not dirty. It's like a program is trying to load or something, but it doesn't matter if I'm on-line or not. Also, has anyone heard of a stealth program and how would you tell if it was installed on your computer? Thanks for any help or suggestions.