Having succesfully upgraded 7000 up to 7057 without to much trouble i upgraded today to 7068.
Took over 2 hours (other upgrades took 30 mins).
After final reboot display driver
conked out, rebooted in 640x480 where the first setup dialog continued.
Reinstalled the display driver, this came immediately up with the previous settings. No reboot necessary.
Background was black, whichever theme i chose the background reset to solid colours. After messing about a bit i suddenly found 3 extra items in the dropdownlist where you choose between backgrounds. All 3 where called: DesktopBackground. Clicking on one of these restored my background.
My antivirus (bitdefender) was lost in there somewhere, firewall wouldn't come up. Reinstalled bitdefender firewall works again.
Better do clean install next time i guess. Weird the other builds worked fine.