Nic
Many thanks. I'll certainly defer to your greater knowledge about "registry cleaning software". Having said that, coincidence or not, the 48 hour period I mentioned finished with just one 'not responding/recovered' message and no freezes.
I've now tried to follow your uninstalling instructions and I have made things worse - 'not responding/recovered' messages and several freezes. Something appears to be stopping me from completely uninstalling 2768 and 2932 and I cannot get as far as the Basic Microsoft Graphics Driver. The checkbox for deleting associated driver files sometimes appears and sometimes does not. I've tried rolling back drivers and then uninstalling but it makes no difference.
I'm trying to uninstall via Control Panel/Device Manager. Is that correct?
I did warn you that I'm a computer thickie!!!!