Thanks Jaco
I don't understand what you mean by a clean instal.
I first did a destructive restore of the old Win XP just to clean up the PC.
I then inserted the Win 7 disk and went through all the install procedure.
When it asked me for the key code, I put in the code appearing on my Win 7 upgrade kit (Family pack for 3 pc)
It took a bit of time, then there were a lot of updates which took even longer.
I now have a message that says i have only 3 days left to activate.
Was this a clean install ?
Do I need to reinstall as you suggest?
It seems to be working ok. Just some problem with the video controller for which I am unable to find update.