Hello,
Sorry to hear you are having issues. Just wondering. Please try this, back up your setting, once that is saved. Click on the Reset settings. Restart explorer. Don't restore setting yet, just as a test create a new group. And try delete the top group. Does the issue still there?
You can do the Restore setting after the test is done. Was thinking it might have something to do with corrupt setting files.
Thanks
Basj,
Stardock Community Assistant.