I am having this exact same problem. I'm an IT, and I'm using Vista Business with UAC disabled and I've stopped the service. I've tried to run the flash cs3 setup four or five times now...it shows the loading window, then it just closes. I restarted still, and no luck.
I read somewhere to register the vbscript.dll and jscript.dll files using cmd prompt, but it didn't resolve my problems. It seems this resolves the 'express install' problem - however, i can't even get to this screen.
Please let me know if anybody has found a solution!
Thanks!