[nfbcs] Before updating

[Tracy Carcione]

I want to update to a later version of Internet Explorer, but I want to keep 
a copy of what I have now, in case the upgrade turns out to be a bad idea. 
Do I save a copy of IExplore.exe in a safe place, or is it more complicated 
than that?  I also see a file called IEDW.exe.  Do I need that?
I'm assuming that good old System Restore will not regress Internet 
Explorer, but if it will, that would be easy.
Thanks for any advice.
Tracy