Thanks for the responses. I'm not exactly a senior, so what does that exactly make me lol
But now that you mentioned it, it seems to happen more frequently ever since I switched from optical to laser mouse @ 1600 DPI last week. I already lowered the speed significantly so that it's not as sensitive. I also enabled the 'Enhanced pointer precision' option, which was fine on my old mouse and in XP.
Maybe that option and laser mice don't get along? I'll start monitoring with it off and hope that should take care of this problem.