If the drive has been wiped, as you said (not formatted), restoring any data from it would be very difficult without professional tools and know-how. That in itself would cost you a lot more than buying a license from MS.
Recovering data from a formatted drive yields better results, but things go downhill fast if that drive has been accessed after the format. Even under ideal circumstances, I don't think the drive can be restored to a bootable state, or even a un-corrupted registry state.