Pull that drive out of your puter and take it to a friends house and back up your data. You will not be able to fix what you have done without destroying the data. If you cannot read the drive on your friends computer you will needs to run data recovery software on that drive to retrive your data.
When your system boots, does windows show two installation choices at POST?
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.