Thread moved to Installation & Upgrades.
Easy. Choose 'Something Else' at the partitioning section of the install. You don't need to format /swap (you can't). Install to / and make sure the other partitions apart from / and /boot are unticked and marked 'Do not use'.
That's it. Good luck.
PS: Did you actually post a thread here to try and fix your problem before deciding to reinstall??? Boot-repair is not going to fix a graphics problem. You might want to post in Multimedia & Video about your graphics issue before taking such drastic measures as a reinstall. Sounds like if you simply remove the driver things will be as they were. A reinstall is a huge leap for what seems like it is a minor problem.
PPS: These two commands should get rid of the offending drivers:
You just need to get to a terminal to input them.
sudo sh /usr/share/ati/fglrx-uninstall.sh
sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev* xorg-driver-fglrx