Re: Error Installing 256.35 (Debian)
Disabling the nouveau driver is done by adding to the /etc/modprobe.d/blacklist.conf file:
in a new line. Save the file and reboot then try to install the driver. Make sure you have the appropiate kernel headers installed.
Other than that zander said, make sure you use the same gcc version as the the one that was used to compile the kernel.
The default in Testing is gcc-4.4, you need 4.3 - install gcc-4.3 then remove the /usr/bin/gcc symlink and replace it with one that points to /usr/bin/gcc-4.3:
ln -s /usr/bin/gcc-4.3 /usr/bin/gcc