Answer Best answer as chosen by user WhySsoSseriouss
Improper drivers and a lot of work...
So you put the hard drive from the old computer as the master drive and attempted to boot the computer and get a blue screen. WPGWPG gave the correct answer for cause of this, it is invalid drivers that is causing this problem. In order to get it to work you may be able to log into safe mode delete the drivers and reinstall the proper ones though this method is hit and miss and usually always more trouble than its worth. As for the reference to the Windows being licensed to another computer, that is a simple fix as the new computer has a sticker on it with the key for the proper license for that computer, simply re-register with the proper key and that is taken care of. The problem of the drivers remains.
I would recommend doing a backup of your critical data and files and then reinstalling Windows on the drive you want as your main drive. The best method for doing this would be to put the original hard drive the computer came with back as your main drive. Use the program or method provided by the computer manufacturer if it is a name brand computer to create restore media. Once you have the restore CD's or USB and you have save all of the data from your old hard drive, reinstall that old hard drive and do a system restore which will install a fresh copy of Windows and all of the proper drivers for that computer.
You can also use cloning software to clone the original hard drive to the older hard drive which will also copy over the hidden restore partition if available as long as the older hard drive is large enough to allow for the clone.
Hope this helps...
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