Sorry to hear about this experience. I would request you to share a few more details like:
The exact version of the OS and Illustrator
Since when are you facing this problem?
Have any recent changes been made to your computer (OS Update/ Antivirus/ Plug-Ins)?
Would it be possible for you to compress the Startup Scripts CC folder into a Zip file from the location mentioned in the error and share the download link to the file here or via DM?
Also, you may try processing any pending Windows Updates and share your observations with us.