Originally Posted by Carlosdzv
It is an Os drive. Windows 7 ultimate 64 BIT
So the drive already has Windows 7 Ultimate 64-bit on it?
Before you removed the drive from your old system you need to start the old PC up and un-install all the main system drivers so that only the original Microsoft Drivers are installed. Then remove the drive and install it in your new PC. If your lucky Windows will boot-up and start finding new devices. If not you'll have to re-install Windows 7 from the DVD. If you have an upgrade version of Windows 7 you can run the upgrade and your programs should still remain.
The most important thing you should do is to make a Back-up of any important documents or files you want to keep in case the worst happens.