Re: Error Code: C5

There is a thread that talks about it:

http://answers.ea.com/t5/STAR-WARS-The-Old-Republic/ERROR-C5-Needing-to-repair-everytime/m-p/4895505#M3536

Also according to this thread:

http://answers.ea.com/t5/STAR-WARS-The-Old-Republic/SWTOR-won-t-launch-after-I-press-quot-play-quot/m-p/4958112#M6796

These steps should be done to resolve it:

http://www.swtor.com/community/showthread.php?t=729911

Hopefully one of these resolves the issue for you.