Wrong letter shows on screen, when typing, over and over.

I have a Pentium 4 tower.   I'm using Windows 7.  Today, when I type an email address, the @ will not show.   Instead, the quotation mark  "  shows in its place.   Tried the Control and Shift suggestion, but no luck.  I have done nothing to my computer recently.  Made no changes to cause this.  Would sure appreciate a fix-it, fast.
O.K.....now I can't post this until I "choose a board".   Can't seem to be able to do that.   No matter what I click on, I get the pop-up and bleep alarm, asking me if I'm sure I want to leave this page.   Seems like I've just wasted a lot of time.   : (

Dave
I have the exact same issue.
I've had my MacBook Air since June 2011, and just noticed this white mark after recently having the machine serviced by Apple Techs.  (mainboard replaced due to frequent freezing).
Nothing new to add, your description matches mine, let me know if you've had luck getting it replaced.  I can't see it when I view my screen straight on or "optimally". 
Thanks
Chris

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