lost keypresses

When I installed a new graphics card I have been unable to use the following in FSX. Shift Enter
Shift Backspace
Ctrl Enter
Ctrl backspace

In FS9 Ctrl Enter
Ctrl Backspace

The card is a gainward 7900 512 Ram
I have a core 2 chip and 1 Gig ram.

I hope someone can help

B Smyth