Can delete Repository - a Strip Command made it unavailable

I wanted to strip some change sets, and the first one succeeded. Then I tried strip the one before the one I just stripped and the system just went into "I am stuck - mode" ... Now the system it has tried stripping for 3 hours or so ... (the first strip took seconds) ??

I have now created a new Repository that works, so would like to delete the "stucked one" - but it is still stuck ..