Meh, most of these people have already answered it for you, but they havent said one thing that rules them all out...

EXCEPTION_VIOLATION_ACCESS

means that you do not have access to either run that program and or action. Are you a administrator on your computer? If your not, you must have either permission (if you have Halo CE in your local hard drive [usually C:\], then it has certain problems with changing things.). To counter that, I saved HCE in my external hard drive, I have no problems.

Another way to fix it, whoever is a administrator, must make you a admin, otherwise you will not be able to run it.

Now what I am saying might not apply to all of us, those were the problems for me, and thats how I fixed them.