Alan, Some time back there was a piece of malwear which did that very thing. Try a scan with such as ccleaner, malwarebytes, etc. Hope this helps, Hal Seabolt -----Original Message----- From: Personal Computer Hardware discussion List [mailto:[log in to unmask]] On Behalf Of alan smith Sent: Sunday, March 28, 2010 6:50 PM To: [log in to unmask] Subject: [PCBUILD] weird mouse? My computer, about 4 years old. OS XPpro sp2, has been working perfectly every day until 2 days ago. I move the mouse, & it may jump anywhere on the screen. And I mean anywhere. It doesn't head for any spot, although most jumps at to a side or off screen! I replaced the mouse ( both optical ) & still the same!! Now that I'm writing this, it's working perfectly!!!! Anything else, programs, solitaire, web sites, it's no go. Does anyone have a suggestion? Many thanks, Al Smith PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml