Hi, awsnap.
I'm Jen, a Windows 10 user just like you. I don't work for Microsoft but I'd be happy to help you figure this out.
I'm sorry to learn that you're still experiencing the error after performing some troubleshooting steps. There are several reasons why this error occurs, it can be due to corrupted game files, server issues, or third-party program interruption like antivirus. To further troubleshoot, I shared an article below and hope this would somehow help.
https://appuals.com/roblox-error-code-268/
*****Note: This is a non-Microsoft website that would provide accurate and safe information. Watch out for ads on the site which are frequently classified as a PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers as they do more harm than good sometimes.*****
I hope it goes well. Feel free to share how it went.
Kind regards,
JC