Is there some confusion above? I note that the original post refers to an error on EXPLORER.EXE, which is Windows Explorer, not Internet Explorer!
While I agree that IE5 and the latest Outlook Express are a very worthwhile upgrade over the older versions, the references to System File Checker are hitting what I think is the original problem. I have had the same problem with some of the Win98 files "going ape" (hasn't everyone!?!)
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If Microsoft brought out a "truly stable" version of Windows - Bill would be out of business as there'd be nobody to buy the "latest version which fixes all the old problems" (and introduces new ones!) I've been steadily working upwards (?) since Windows 286 !!
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Flight Sims, very expensive toys - but real fun to play with!