My computer is laggy after the disorder of the keyboard。
About 30 days ago,my keyboard worked disorderly.For example ,when I printed "a",the screen displayed "aa",or "aaa".Sometimes the question didnt exist.At that time ,I didn't confirm where the question come from,so I didn't replace the keyboard .With time went by,the computer run slower.Several days ago ,I replaced the keyboard with a new one.Keyboard worked smoothely but the computer still lagged.In another word，the lag caused by the former keyboard is still there.I have uesd several ways trying to solve this problem such as recoverying the system with Ghost,reinstall the VGA driver but the computer is still laggy.I don't know where the problem come from.
The computer runs about 30% slower than before and when I use Photshop ,I must wait doubled or tripled time to wait ,sometime even worse.It seems that I shoud replace my keyboard immediately.
So,how to repair my computer?
More details：I have tried to unload the driver of keyboard，the result is that the mouse cant work.
I think the keyboard and the mouse have been disordered.
P.S. I have tested the memory and found no faults.
More details:Anohter bad thing is that ,i found it minutes ago,when i open several programs,the CPU usage elevate to 93%.I opened BT,Exploer and Photoshop.
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