Hi Richard,
It will be about 7 or 8 hours before I am at my home computer so here are some links you could checkout.
http://lastbit.com/regsnap/default.asp
http://www.pcworld.com/downloads/file_description/0,fid,19840,00.asp
http://www.sharewarejunction.com/info.asp?ProductID=4824
http://www.softlookup.com/preview/dis10275.html
Theses links seem to offer regsnap as shareware, freeware, timetrial & commercial. Maybe one of them might suit your needs immediately. Confusing range of versions & choices - it appears the author has been evolving his marketing strategy. You might also try doing a google search of "regsnap" it gave me a lot of links.
PS: This link seems to offer a beta version for free (It appears version up to 2.0 were freeware):
http://www.cspltd.ndirect.co.uk/windows/system.htm
Ah: I see why he went commercial The MSDN site gives it a hearty recommendation.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnexnt02/html/ewn0102.asp
[ 08. September 2003, 18:20: Message edited by: Jack Lothian ]
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Jack