Help my computer won't open any windows apps.

I was wondering if you could help me please, I am desperately seeking help as my computer won't open any windows applications at all.It says something about not being able to find it on the c:/drive also my windows vista toollbar doesn't work across the top of my screen and my clock and calender have disappeared.
I would be very grateful if you could help me sort this problem out.


Kind regards
Mrs D Hornshaw

bump