Why can't I disable hardware accelerator?

I tried to record a game program and every time I did, there was only a black screen showing. I did my research, I found out I needed to disable my hardware accelerator. I'm on Windows Vista, and someone told me to go to Control Panel>Appearance And Personalization>Personalization>Display Settings>Advanced Settings>Troubleshoot>Change Settings. I did just that but the "Change Settings" wasn't allowing me to click on it. It's not a glitch or anything, they won't give me authorization to do so. Next to it there is an Administrator icon, but my account is the computer admin. How in the world do I disable hardware accelerator?