Yesterday I installed a second Nvidia gtx 560ti, and had to use coolbits because one card has more memory than the other. I successfully got SLI functioning, but I was having driver issues, so i re-installed the drivers. SLI was then disabled, and removed from the Nvidia control panel. I went back to the registry files, an attempted to recreate the necccisary file, but it had no effect on the SLI options returning. So, what can I do to re-enable SLI?