Examine your security issues with read/write access to your installation folders.
SAS Tech Support was confounded by the security lock-down(s) we had @MyCompany.
And I agree with SASKiwi: rebuild is faster, especially given the alternative of editing the Registry.
oh, did I mention Pending Reboot?
that was another "Who flipped That bit?" item that confounds (un)installers.
Ron Fehd "That's a Hardware Problem!" maven