Well, it's either an issue with the keyboard (hardware), or with the PC (driver, mapping or hardware also).
So the very first thing to do is to try another keyboard on this PC (it would be nice to try 2 or 3: PS/2, USB, wireless) and this keyboard on another PC.
Please post your findings, so we can advice about the next step to take.
I've searched several days on the web, but can't find an answer that works for me.
I have a logitech g15 keyboard, windows vista, desktop pc.
So the following happens.
When I press the tilde key I get a '6'
When I press tab I get a '9' AND it jumps to the next box (which tab should do).
when I press prt screen I get ' \ '
when I press numpad 8 I get the number AND the search box in the bottom of the browser
Basically every 'special' key is behaving as if they have a double fuction at the same time.
I also can't turn numlock and scroll lock off at the same time: when I press numlock it automatically turns on scroll lock.
This all started about a week ago. I think it happened when I enabled a macro in Excel, but I'm not sure. I deleted the file with the macro, didnt help.
I've looked into keyboard language settings and it's fine.
If anyone can help me out, would be great. Not having tab = nightmare.