Hi Michelle,
Seems extremely strange. Two things though. U would do well to list atleast the relevant hardware ( video card, monitor, etc. ) and two, probably re-installing ur graphics driver ( hope ur using the latest one version 4363 ).
If that doesnt help maybe a glance thru the readme or head over to www.nvnews.net or www.nforceHQ.com
Sorry I couldnt be more helpful. Luck with UR stuff.
See ya,
madmax.