i just came across this little utility,called defprof.exe, which needs to be run as administrator from a command prompt.

ForensiT Free Downloads

previously, i had been creating a local default user by using this guide :-

http://www.answersthatwork.com/Downl..._Windows_7.PDF

I have found no problems so far after the machine has been sysprepped, but ........

hope it helps someone