Keys getting stuck (not physically)

Hi,
Today I realized that my ctrl key gets stuck. If I try and press ctrl + 1 nothing happens, but if I after that press just 1 it behaves as i pressed ctrl + 1 and it won't stop behaving like that until I press just ctrl to "deactivate" it.
The only way to solve it temporarily is to restart the computer
This started after the following changes to the computer was done:
Used the software updater (not used since buying the computer in may/june or so)
Installed USB Overdrive
Installed WoW
Any ideas on how this could be solved?

Try resetting the SMC and if that doesn't handle it try resetting the PRAM. Here are instructions if you aren't familiar with these:
_SMC RESET_
• Shut down the computer.
• Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected. Disconnect all peripherals.
• On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
• Release all the keys and the power button at the same time.
• Press the power button to turn on the computer.
_PRAM RESET_
• Shut down the computer.
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.
• Release the keys.
Roger

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