How to disable a device on cgminer ?

[xyzwarrior]

I have 2 GPU on my computer, 1 HD 6670 and 1 HD 7970. I want to use my 6670 to play games and 7970 to scrypt miining. The 6670 is on device 0 and 7970 is on device 1. The 6670 can't mine scrypt because whenever I try to launch cgminer with only 6670, it will stopped working, but the 7790 can scrypt. But when I have both card in my PC, and even when I disable device 0 on cgminer, I still won't start. A windows box saying cgminer has stopped working will pop.
 My cgminer config is :
cgminer -d 1 --scrypt -o stratum+tcp://stratum2.wemineltc.com:3333 -u x -p x -o stratum+tcp://us3.wemineltc.com:3333 -u x -p x --thread-concurrency 10240 -I 13 -w 256 -g 2

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[Trillium]

Have you seen this, from GPU-README.txt ?:

Q: cgminer crashes immediately on startup.
A: One of the common reasons for this is that you have mixed files on your
machine for the driver or SDK. Windows has a nasty history of not cleanly
uninstalling files so you may have to use third party tools like driversweeper
to remove old versions. The other common reason for this is windows
antivirus software is disabling one of the DLLs from working. If cgminer
starts with the -T option but never starts without it, this is a sure fire
sign you have this problem and will have to disable your antivirus or make
exceptions.

[os2sam]

I have 2 GPU on my computer, 1 HD 6670 and 1 HD 7970. I want to use my 6670 to play games and 7970 to scrypt miining. The 6670 is on device 0 and 7970 is on device 1. The 6670 can't mine scrypt because whenever I try to launch cgminer with only 6670, it will stopped working, but the 7790 can scrypt. But when I have both card in my PC, and even when I disable device 0 on cgminer, I still won't start. A windows box saying cgminer has stopped working will pop.
 My cgminer config is :
cgminer -d 1 --scrypt -o stratum+tcp://stratum2.wemineltc.com:3333 -u x -p x -o stratum+tcp://us3.wemineltc.com:3333 -u x -p x --thread-concurrency 10240 -I 13 -w 256 -g 2

-------------Readme-----------------------
--remove-disabled   Remove disabled devices entirely, as if they didn't exist
--device|-d <arg>   Select device to use, one value, range and/or comma separated (e.g. 0-2,4) default: all
-------------Readme Not-------------------

Should look something like this

-d 0 --remove-disabled