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Lately, my cursor has been frozen in the middle of the screen at startup. I thought it was my wireless optical mouse, but after switching back to a regular (cabled) mouse, it did it again. I just unplugged, and replugged the mouse and it began working normally. I cleaned my system previously with Spybot, Adaware, Regscrub XP, and have AVG, Zonealarm and MS Spyware updated. I ran AVG and Stinger and found nothing. Any idea as to what might cause this? Could it be related to my computer turning itself on, in the middle of the night?