Do you have the Couatl menu at least ?If you are missing the whole Couatl menu, try to reinstall with the antivirus disabled, and configure the antivirus to exclude the whole Addon Manager folder from scanning before starting the sim.
It might be a problem with your VC++ runtime libraries. Try the solution discussed here:http://www.fsdreamteam.com/forum/index.php/topic,17170.msg122193.html#msg122193