Recently I am facing a problem. The problem is when I open any page in any program such as Ms Word, Excel, Notepad, any browser like Mozila, Chrome, IE, the page automatically scroll down to the end of page. Whenever I try to scroll the page to the desired position, I could not stop the page. I checked the system with Antivirus, but there is no problem found. My system is duel boot system with Win XP SP-3 and Windows 7. In both the OS I am facing same problem. Even in the safe mode the problem is same. Is it a virus problem or Hardware problem? Otherwise my system is 100% OK. Please give me some light to solve the problem with out formating the OS.