Hello Diablo221,
I am Jaspreet Singh.
Please follow these steps :
Search for cmd in the search bar.
Right click on the results and click on run as administrator.
Paste this command in it and press enter :
cd %ProgramFiles%\Windows Defender
MpCmdRun.exe -removedefinitions -dynamicsignatures
MpCmdRun.exe -SignatureUpdate
Restart your device after this.