Wow, I've never seen that one before...looks like Cedega may have messed up your root privileges. Do you have multiple accounts on the computer? If so be sure you're signed into to one you used to install the system.
Could try
this, in particular post
#6, to make sure your account has sudo rights...other than that I'd suggest a wipe and reinstall, that would probably be the quickest and easiest.
If you do reinstall, create a separate home partition! It's saved me many headaches when reinstalling or trying out new distros...
[link]
You could even try to save your current /home/ by following
this guide before reinstalling but if you're reinstalling anyway easier to just back up and restore stuff on the new partition than trying to split it.