Just a quick update.

I had to do a full fresh boot from the recovery cd's because all that switching off with the power button really did more damage.
Everything was fine for a few days but then it started freezing again.
After a bit of digging i read in a random forum somewhere ( its laughable there are so many websites relating to vista problems already ) that my mouse could be a pproblem. im using a logitech Click Plus . So ive updated to the vista drivers and had a full day and night with no probs.

My new vista motto 'slowly but surely'
thanks