AFAIK, reinstalling it is your first option here
Btw, which OP do you operate on atm ??

Thanks in progress

Frazzle

Antec® Case
Intel® X58 Chipset
Intel® i7 975 Quad Core
8 GB RAM DDR3
SSD OCZ®-VERTEX2 3.5 x4 ; HD 600 GB
NVIDIA® GeForce GTX 295 Memory 1795GB