Hi AndreasSæbø, as the Security Center is grayed out then you can check out the link below for reference and follow the steps provided and see how it goes.
https://www.kapilarya.com/the-windows-security-...
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
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