windows could not update registry data in the installation

Same problem here. Going from Vista ultimate to Windows 7 ultimate. Using purchased upgrade DVD. Tried solutions mentioned however it still rolls back. Any other ideas? Thanks

Install setup from Flash disk, then when the installations is running, at first restart take out the Flash disk, then put in again when the windows start...
the words " windows could not update the registry" will not appear.
i have tried it, and sucsess..
or if it way fails, do this:
prepare ur computer for installations for a week ( do nothing to ur computer i mean)
then ask help from God
and smash ur computer