Corrupted xorg.conf, can no longer boot...

I manually modified my xorg.conf to adjust performance issues with my fedora 17 environment and changed this:

Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
Option "Monitor-CRT1" "0-CRT1"
BusID "PCI:1:0:0"
EndSection


to this:

Section "Device"
Identifier "ATI Radeon"
Driver "ati"
Option "AccelMethod" "EXA"
Option "MigrationHeuristic" "greedy"
Option "AccelDFS" "true"
Option "EnablePageFlip" "true"
Option "EnableDepthMoves" "true"
EndSection

The latter was a solution that I copied off the net from someone else's similar performance issue. I saved the file and rebooted. When the fedora logo screen came up and went, this text followed and there is no movement from there. I have to CTRL+ALT+DELETE to reboot.

Here is a screenshot of the screen where the system remains.



As such I can not modify the file since I cannot log into fedora, and when I run fedora through the installation USB, I can access the file through the connected devices list on the left side but I do not have permission to modify the file.

I do not want to re-format fedora and reinstall packages but if its a last resort then I must.