Vista - Disappearing Windows Explorer

Hi,

I upgraded to Vista RC1 (32-bit) from XP Home. The installation went
fine and everything appears to work correctly except for Windows
Explorer. Explorer just will not come up when running in Normal mode -
it will flash up for a second and then close again, every time. There
is no error message and nothing I can see in te Event Logs either. And
Explorer works fine when Vista is in Safe mode, so the issue seems to
be limited to when Vist is running in Normal mode.

I've used Autoruns from Sysinternals to disable any DLLs/shell
extensions which are not standard Windows ones and that didn't seem to
help. I've also tried uninstalling anything which might cause issues
with Vista and that didn't seem to help either. Anybody got any ideas?
A way to log everything when Explorer starts so that I can actually see
what is going on? Or some other way to troubleshoot the issue? Thanks
in advance for any help.

Fahim
--