Re: hard drive problems
Can't remove one hard drive that has an OS from one computer and move it to another computer. The OS has configuration files to allow it to read the hardware profile of the system (CPU, motherboard, etc), and if that profile has changed the OS cannot load.
Only two options here, either do a repair installation of the OS or reinstall your OS. The former SHOULDN'T delete your files or programs, but always backup if possible. The latter will delete everything, but sometimes that isn't an important factor.