Put old hard drive in new built computer

I have an old Dell desktop computer and I want to put the harddrive in my new build custom computer. I have tried to simply plug the old hard drive in but I can not use the apps from the old drive.
How can I use my old hard drive and it's applications from my older computer?

They both use 64bit Win 7 OS.

Please help. Thank you!!
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More about put hard drive built computer
  1. you can't, you need to reinstall it on the new computer.
  2. SA rdg1101 states, you will be required to re-install Windows and your applications onto the hard drive if you want to use it in your new desktop.

    The currently installed OS, drivers and registry are currently looking for the old hardware of your laptop. Not finding it, the system is failing.

    -Wolf sends
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