Tab key stops tabbing

[dfrench]

Hi,
I'm using vista every so often the tab key stops functioning. (E.g.
in excel when i hit tab it doesn't go to next cell, or in interent
explorer it doesn't tab). The key is still working as if I hit alt +
tab or windows key + tab it functions.

I think I must be hitting some key combination to switch of tabbing.

Any ideas?

 

[Spaceman]

By any chance,
Do you have Firefox installed?