failed to uninstall nRF connect SDK from tool chain manager

HI

when I try to uninstall/remove my connect sdk, tool chain manager says:

Failed to remove C:\nordicsemi\v2.6.0, operation not permitted. Please close any application or window that might keep this environment locked, then try to remove it again.

I restarted my laptop to make sure no instance is running.

Any clue what is going wrong.

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