pls help in this issue

8
Go to Control panel and change it mouse into keyboard
"It is very easy to defeat someone, But It's very hard to win someone"                                                                                        - Dr.A.P.J.Abdul Kalam
go to mouse settings in control panel.change options for drag and drop r chang ur left and right buttons
I think that you are using your mouse for more than 3 yrs... 
It has the high probability of problem in mouse during the left click..