now at 1st one would need to understand the cause,
If its a hardware problem then only thing u could and should do is, ask for warenty if availavle, or replace the mouse with new one, i think now days mouse are available for Rs. 250 or even under Rs. 200
so do be sure its a hrdware problem, ask any of ur frnds mouse plug it in and work

... if that solve the problem then u know its one hardware problem....
if not, then may be a software issue...
now if its a software problem then u may have a malware or any such !! so, i suggest, u may use any good AntiVirus and antispyware to scan the system to see if there is any...
AntiVirus, *www.kaspersky.com , 30 day trial available
AntiSpyware *www.spybot.info , its a free software
