So I have a Windows XP operating systems and it's on a 2000 hp desktop computer. Just recently I completely restored my computer to factory settings because the cursor would move all over the screen and the start menu pops up and it tries to close my brower or it'll click random programs. Now I've installed AVG anti-virus, online armor firewall, and spyhunter. Yet my computer is still doing the same thing and I even downloaded malwarebytes but it said nothing was infected on my computer. I'm a little confused. If anyone could give me some help it'd be greatly appreciated. Thank you! =]

I would try two things.

First, replace the keyboard, see if that help.
Next, replace the mouse.

Either/both could cause the kind of problems you are describing.