Graphics injectors are other kexts to enable QE/CI, like nvinject, natit, etc. NVEnabler is another one like that, you can install only one of those at a time, if you installed others you have to remove it.
EFI Strings are in com.apple.Boot.plist file, either in /Extra or in /Library/Preferences/SystemConfiguration, if you used EFIStudio or OSX86Tools you may have an entry on those files with "device-properties" and a long string or numbers.
DSDT edits are in a DSDT.aml file in /Extra, used by Chameleon to inject the same properties, if you dont have a file there you should not worry about that for now.

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AsRock P45TS | C2D E8200 | GeForce 8600GTS
Mac OS X Snow Leopard 10.6.1 + Windows 7 Ultimate 6.1.7600 + Fedora 11