Teach in Clovis

Did as you said, but....when I pasted the wording in Start>Run, the box appears but cannot uncheck the "Check File Signatures" box. It is already checked but appears to be "locked" - cannot check or uncheck it - all of the other boxes can have the checks unchecked if needed (or checked) but not the "Check File Signatures" box.
I went ahead and ran DSS just to see if possibly the lock out would not affect the outcome. No luck. Same error message appeared, though the time it took to pop open was about 1/2 minute longer than usual. Tried the total process as typed three times with the same results each time.