You might want to browse through the RCC troubleshooting guide (if you haven't already) to see if it mentions this specific issue. You can download the document right from the BCM.
If you do resort to re-installing RCC (as I've had to do several times), you'll need to manually uninstall mysql. The RCC un-installer won't do that for you. After you've removed all RCC software components. Delete all registry entries for the software you've removed. Otherwise you'll get weird behavior when you reinstall, such as the admin password remaining the same as it was prior to the un-install.
Good luck. I have to confess, I've reinstalled the OS a few times to resolve RCC issues.