Keyboard And Mouse Bugging

Got my new pc, all good and fine (well thats what i thought) Installed Call Of Duty 1,Call Of Duty 2,Call Of Duty 4 And The New Call Of Duty World At War but while playing the games using a USB keyboard and Mouse they both bug (Only About 10% of the time for the mouse) but very rarely i have 1-2mins of where my keyboard doesnt have the problem, the problem is as follwed ;

1. As Playing FPS (use mostly W,A,S,D) to move so move around by pressing these keys, then when stopping release them
2. After releasing the keys i still move, asif the keyboard is still being pressed down
3. To stop this i must repress and re release the key
4. I die because of the silly moving

Im not the best at the tech side of the computering but i have helped out a few people before...

so firstly the obvious solution would to replace the keyboard and mouse so thats what i decided to do, but im still getting the problem!

Just Wondering If Someone Could Point Me In The Right Direction Into Getting This Fixed

Cheers For Reading

ThankYou

im using a microsoft keyboard and mouse and using the boxes.. so proper versions.. i dont know if its because i have 64bit Vista and they need a new driver?

no this doesnt work im totally lost now lol.. have no idea what it could be