Hi, I have a compaq presario 2500, running windows xp, an optical hp mouse and the mouse does what ever it wants, normally if I want to jump from window to window it won't go to the new window, it will desapear and go to the edges of the screen or the corners, I need to move it for a while to go where I want to go... can some one help me to find out what it is?

I ran antivirus and spyware and the computer is clean.

Thanks for all your help!