Activating license after new installation of Windows on the same computer

Hello,
I would like to use my license on my computer.
A month ago I purchased a new computer and I activated the license on it. Yesterday my computer had issues and I had to reinstall the Windows on this same computer. I also had to reinstall Trados. But the license does not automatically reinstal. What should I do? If I return the license would I then be able to instal it on the same computer?
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