@UBF
I think you're right, and that the Devs &Printers was just randomly working irrespective of what else I did.
I did another clean install, and of course it worked, and then performed a "1 Click Clean" with Vista Manager x64, and it stopped working again.
I've ditched RC1 as it's basically falling apart on my PC - on installing programs, it wont create start menu shortcuts (*.lnk), and my Symantec AV Corp x64 10.2 will neither update nor autoprotect.
Asus P5N-MX
4GB RAM
2 x Hitachi 500GB
Q6600
Radeon PCIe HD3650