What did you use to attempt to convert to FAT 32 and form what? (NTFS, FAT 16?) We need to know this first off. If you have negatively affected the partition data your computer won't find the OS load, which sounds like that what is happening. You might be able to install NTFS Partition on the drive with the existing data using partition Magic. But we need to know the how and whats of what you did to the computer.
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.