i just built my new pc and having mouse prbs Check with Logitec for any issues in running your mouse under SP3. I had XP-SP2 running on my laptop for over a year without any problems. When I downloaded an installed SP3, I couldn't get my soundcard to work anymore. Since SP3 is still fairly ew I would expect there to be problems with certain hardware.
Un-install the drivers of your mouse and re-install them again to see if this solves the problem. If not un-install SP3 and install SP2 instead. If your mouse is working then, at least you know there is no hardware problem. You could try SP3 again afterwards to see what happens.
Cheers:
Chris
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My System: Willy Wonka's Polygon Factory Processor(s): Core 2 Duo E8500 2x3.16Ghz 1333GHz | Motherboard: Gigabyte GA-EP35 DS3R Socket 775 | RAM Memory: 4GB Micron PC-6400 (800Mhz) | Graphics Card(s): XFX 8600GT 256Mb DDR3 540Mhz | Sound Card: Onboard 7.1 Sound | Hard Drive(s): 400GB Samsung / 36GB Raptor (x2) | Optical Drive(s): Optiarc AD-7200D 20x DVD-RW (x2) | Case / PSU: Cosmos RC-1000 / Arctic 600W PSU | Cooling: Zalman CNPS9700 / Noctura NC-U6 | Network / Internet: Onboard | Monitor(s): Samsung 2232BW 22" (x2) | Operating System(s): Win-XP (SP2) | |