I HAVE A DELL LAPTOP WITH THAT HAS WINDOWS VISTA. I'VE DONE VIRUS/ANTISPYWARE SCANS ON IT YET, I NOTICE THAT MY SCREEN SUDDENLY SCROLLS DOWN REPEATEDLY WHILE IN AN EXCEL OR WORD DOCUMENT, AS WELL AS SURFING THE INTERNET USING INTERNET EXPLORER?? COULD THERE BE A VIRUS OR EVEN SPYWARE THAT MIGHT HAVE BEEN OVERLOOKED. FOR MY ANTIVIRUS, I USE THE FREE VERSION OF AVG 9.0 AS WELL AS WINDOWS DEFENDER. PLEASE NOTE: BOTH PROGRAMS ARE CURRENTLY UP TO DATE. BOTH PROGRAMS HAVE RAN AND I FOUND 5 VIRUSES AND DELETED ALL FROM MY VIRUS VAULT AND RESCAN IT. YET THE SAME PROBLEM OCCURS. IS THERE ANYONE OUT THERE THAT CAN ASSIST ME WITH THIS.. THANK U! 
