First of all. Go to the Adobe website and make sure your rig meets min requirements. Conflicting A/V's can also throw up such errors as they will not allow certain files to be written.
1. Run only 1 A/V.
2. List ALL Adobe free downloads you've currently got installed.
You've got a simple permissions issue from either an A/V or a "free" Adobe download.
If you are still experiencing the issue after applying this fix you can try Illustrator Repair Toolbox