On-Screen Keyboard has stopped working.

Hi my name is Lee, and I'm having a problem with my Gateway NV78 OS Windows 7 64-bit.
I ran a couple of computer optimizers, Registry cleaners, computer tuneup programs and I notice sometime later when attempting to use the on-screen keyboard it stalls after one keystroke then reads "accessibility on-screen keyboard has stopped working" and shuts down.
Can anyone help me get my on-screen keyboard functional again?

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