macrobid,

Thank you for using the Dell Community Forum.

Reinstall the chipset drivers below then the video card drivers to see if that will resolve the issue.

Chipset:

http://support.dell.com/support/downloads/download.aspx?c=us&cs=04&l=en&s=bsd&releaseid=R41334&SystemID=DIM_PNT_P4_2300&os=WW1&osl=en&deviceid=3268&devlib=0&typecnt=1&vercnt=1&formatcnt=1&libid=27&fileid=48256