Ok, so rather than mucking with the registry directly, I used the Admin Tools as one poster described:
In fact, the easiest way is to simply run msconfig as I've always been doing in XP to get to that panel to remove unnecessary services.To stop the UAC you can go into your Control Panel, then Administrative Tools --> System Configuration --> Tools Tab --> Down to Disable UAC.
I disabled UAC and rebooted, but still get a blank folder when I try to access my Vista shares. I made sure "Password protected sharing" is off, and I can access the share from my XP PC, although it still requires me to type in my username and password. I even rebooted my Ubuntu PC and still can't access Vista.