[ctrl][alt][f#] will take you out of Xwindows, but as you've found out, it's still running. When you boot straight to the GUI, the X-server gets set-up to re-run anytime it gets killed.
You can either set your system to boot to runlevel 3, in /etc/inittab, or run "telinit 3" as root. When you've installed the drivers, reset /etc/inittab, if you went that way, or "telinit 5".
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