If you can't get into the gui, or desktop, when you boot hit the 3 key at the first boot menu, and then hit enter. This will take you into run mode 3, which is a command line interface. Log in as root, and type:
This will bring up the sax2 program, from which you can adjust your monitor resolution. If you can't get sax2 to work, try nano to edit /etc/X11/xorg.conf:
Sax2 will probably work. When you get that fixed, there are special instructions for installing the nVidia driver in SuSE 10.1. Make sure you print those out. You can't have X running when you install the nVidia driver, but you can't download the driver without a graphical browser. So you need to go in X to get the driver, then kill X with CTRL_ALT_BACKSPACE, hit CTRL_ALT_F1 to get a terminal, log in as root, type:
ps aux | grep 'kdm'
Then you can install the nVidia driver by going to the directory where the binary is:
chmod a+x NV*