Keyboard problem Sometimes my ' and ? don't work

I have a keyboard problem.. I think...... sometimes my apostrophe doesnt work. It worked up in the title of this thread but I cant use it here. Also my question mark button and arrows dont work. But only on this forum. I dont get it. Got any suggestions "question mark"

I have replaced the keyboard and tried to restore my PC to last week but it still does it just here?

Aw hell now the ? works But the arrows are still out.
 
Thanks... Something I didn't think of. IE 7 works so I upgraded to the newest firefox and it seems to be working now... We'll see. if it keeps going?
 
This was one of those cheapy keyboards that they throw in when you buy a new computer so I thought it was the keyboard.. But Darin nailed it and it was a software issue solved by uploading a newer version of firefox.
 
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