Hi Eric, thanks for responding.
No, - I sort of gave up on it, and hoped it would go away.
Same thing - although mine is not a desperate case, as I have been given a copy of CS4 to use by my employers, so can sneak the basic work in after hours, but on my own machine (specs above) have not been able to get a preview at any time with Sculptor 2 or 3 on DWCS3.
Looking at the other posts and contemplating some of the more drastic remedies (uninstalls of DW, AV extensions etc. just made me feel tired and I decided to leave well alone.
Any (easy) advice would be welcome, although there will be people with more immediate problems. I'm ok with it not working for the moment, and happy to wait.