What is the error you get when you try to retract the solution?
You can try to manually retract and remove the solution with the following commands (execute them from the command prompt on the server):
stsadm -o retractsolution -name RadEditorMOSS.wsp -immediate -allcontenturlsor
stsadm -o retractsolution -name RadEditorMOSS.wsp -immediate -url http://intranet...
wait a few minutes for the job to finish
stsadm -o deletesolution -name RadEditorMOSS.wsp
the Telerik team