You need to reinstall illustrator as it cannot find some folders and or files in some specific folders. This can happen due to overly aggressive virus software and also registry cleaners.

If a simple reinstall doesn't work, you will need to uninstall, run the Adobe uninstall cleaner application for your version, then reinstall. You should be able to Google the download for the cleaner application, just make sure it is from Adobe's website. I am using a phone right now else I would post the URL for it. But if you end up needing it, just respond here and I'll fire up the computer.

Mike