I think your MBR is going to be messed up, so it might not work to just moving some files around.
If you have a good install on you new hard drive, except for the boot, I would unplug the old hard drive. Use the Windows install DVD to "Repair" your system. A startup Repair might do it.
If you can get to the advanced boot options by hitting F8, you might be able to do it from there.
You do, as reghakr says, have to be careful as to which drive is drive 0 in the bios. And when I refer to drive 0, I am not talking about a partition letter like D:, but a physical hard drive.