I've just upgraded from vista ultimate, 64 bit, to windows 7 ultimate, 64 bit. I ran into an immediate problem because I'd not uninstalled the norton UAC utility. This manifested as anything requiring a UAC prompt giving me a signing error and not working. I then found the system wouldn't boot to safe mode (reset itself about 5 seconds after reaching login screen). Eventually I managed to fix this by booting from a CD and switching UAC off by editing the registry. Whilst hairy sounding, this all seemed to work, and most of the symptoms I was experiencing have gone.
Not everything is rosy though. Many of my control panel applets will not run. I select them from the control panel menu (or any other way, eg right click on desktop, select personalise) and absolutely nothing happens. Watching task manager doesn't even show a new process being created and destroyed. It looks as though standard windows control panels won't work, but third party ones will (eg, my anti-virus),
Does anyone have any suggestions on tracking this down? With the safe mode problem as well, I'll certainly be doing a full reinstall soon, but I couldn't afford the couple of days it would take to do this at the moment.
Thanks for any suggestions,