If you install nv112 it will clear all the graphics driver issues.
To try and clear nv111 you need copy the libwfb.so libraries into the directories I posted earlier. To do this will require some work. You have to boot into Failsafe mode and when it asks to mount the root filesystem as /a enter "y" for yes. Instead of finding the libraries on the nv111 DVD, I've taken the liberty to put them on my company website so you can download them.
You'll need to burn it on a CD or usb stick and mount it manually.
To mount it manually you need to determine the driver for mounting it is. You have to issue the command "rmformat" without the quotes. If you had a usb stick in when you entered rmformat, then to mount that:
mount -F pcfs /dve/dsk/c0t0d0p0:c /mnt
If it's a CD issue:
mount -F hsfs /dev/dsk/c0t0d0s2 /mnt
Where the "c0t0d0s2 or c0t0d0p0 is replaced by what comes from the output of rmformat.
Then copy them over:
cp /mnt/libwfb.so /a/usr/X11/lib/modules/libwfb.so
cp /mnt/amd64/libwfb.so /a/usr/X11/lib/modules/amd64/libwfb.so
It will probably be far easier to just upgrade again to nv111 or nv112.