>Thanks for the tip Edward, but the error persists.
>DCOM, reported as a cause of C0000005 errors is installed because I've checked my W95 registry, as Ed Rauh advised.
>Specifically, when CLEAR ALL is executed, it activates my Mainmenu.Unload event which does 'RELEASE WINDOW mainmenu', then executes the remaining commands in shut_dwn.prg. But when it hits QUIT, I get the C0000005 error which says the error was 'Called from - ' line 6 in Mainmenu.spr (DO FORM "mainmenu.scx" NAME _S3F0YPVGF LINKED TO m._rval) and from line 187 from my 'set main' main.prg (DO mainmenu.spr).
>Franz, do you mean SP3 for VisualFoxPro6 or SP3 for NT?

Could it be this mainmenu.scx form is not unloading properly? After you Clear All, m._rval should get released, and so the form it refers to should release itself. Now if that form is unsuccessfully unloading, i.e. having a dangling object referrence, or uncommitted changes... well, that's where I'd start looking at.