Have you Reset Preferences?
Windows - CTRL-SHIFT-ALT immediately after you double-click the PS icon.
I will try that, Thanks. but wouldn't a delete and reinstall have firxed that?
Not necessarily as sometimes certain files aren't removed during an uninstall. I have noticed some programs will ask if I want to also remove preference or cache files during uninstall, this might be even more the case if you have other Adobe products installed. Don't recall if photoshop is one of those.
No luck, the liquify tool still doesn't work, any other suggestions? Thanks
Yes, one I can think of. Get the make and model of your video card and head over to the card manufacturer's website.
Check for and install the latest drivers for your card.
Also see if changing the settings of your GPU helps. Uncheck everything (OpenCL Anti-alias 30 bit displays) and start at Basic. then work your way up to Normal and Advanced.