Thanks so much. I've recently done my updates but it doesn't solve this problem. Ugh. Other suggestions???
Update/Reinstall urgent and recommended drivers from dell
http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=STUDIO1535&os=WLH&osl=en&catid=&impid=