I have been having this problem for quite a while now, and I thought it was a problem with my keyboard, however upon getting a new keyboard today I'm experiencing the same problem.
The zero key on my keyboard doesn't seen to do anything, however when I press shift it does produce a ")." I am not experiencing this problem with the zero key on the keypad, that works fine.
What I have noticed when I press the zero key while I'm typing is that is seems to remove the ClearType or something. Screenshot
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The Ds are before pressing zero, the Gs are after.
Any help would be greatly appreciated. This is driving me crazy at this point.
Thanks