Hi,
Just for grins I tried grub commands to boot the system as single user or non-GUI initialization, but, single user failed completely while init 3 still tried to run AVWizard with nvidia-current reboot.
On my system...
grub>set root=(hd0,msdos1)
grub>linux /vmlinuz ro root=UUID=blah-blah-blah-blah-blah 1 (or 3)
grub>initrd /initrd.img
grub>boot
Cheers.