I just found a wired keyboard in the closet in the same room as this computer is in and I plugged it in. I usually test these keyboards on Single Player Survivor on Aliens vs Predator 2010. This keyboard was working perfectly!
I didn't try wired keyboards before because I thought they wouldn't work altogether!
Right now, I am using the keyboard, Office Essentials Multimedia Keyboard and the mouse, Microsoft Wireless Optical Mouse 2.0A and now I can be the best I can without ANY hardware issues on FPS games! Thanks a bunch for pointing me in that direction and intimidating me to try!
Thanks a bunch, WindowsStar!
PS: How do you add REP to someone?