In the boot sequence, before it gets to trying to load windows does it show that it's recognuizing the drive correctly (right IDE channel type & size?) If not, then you need to set that correctly in the BIOS setup. I don't know anything about the newer SATA drives, were you using a SATA and the old one was IDE? If you've well and truly tried all the software options then some hardware config or error seems like the only other possibility. If the data is valuable to you it may be time to call in the techs, though I'd steer clear of the chain stores where it's hit or miss at best.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken