The Shift keys on my laptop are not working, though it was fine until last night.
I'm running Windows 7 Professional 32-bit on a Dell Latitude e6410.
I know it's a little late, but maybe helpful for others who come here - I had the same problem with an Acer Aspire VA70. I turned Sticky Keys on and off again, and now my shift keys are back to normal.
You could have a hardware issue, best thing to verify you do not have a hardware issue. Is to run the on-board diagnostics.
From a complete shutdown, press and Hold the [FN key] and the [Power button] at the same time. When lights start to come on, release both buttons.
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