It is USB? Place the mouse in the Primary USB slot on the back of your case, unless it is ps/2(Which I doubt). Take out the ps/2 mouse and reboot. should work fine. Opps....it's ps/2 and so you need to install the dirvers for that mouse that came with it.
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.