Windows HD Won't Mount - "The disk you inserted..."

[Takuro]

After running PerfectDisk to defragment my Windows Vista hard drive, OS X cannot mount my Windows HD. Upon boot, I receive the error "The disk you inserted could not be read..." as if it's a corrupt volume or something. I can boot into Vista fine, however, and OS X was able to mount the drive fine prior to the defrag.

 

PerfectDisk does a very deep defrag and moves even the most rigidly-locked system files to perform the most thorough optimization of disk space. I think this somehow is linked to why OS X cannot read the drive now, but I'm not totally sure.

 

Any ideas on how to remedy the situation? Thanks.