Hi there,

Thank you for providing us with all the information. Can you please answer more questions in order for us to investigate further:

1. Do you play any other online games on Steam? Are you having an issue playing any on them?
2. When did the issue start? is it after the update on Wednesday?
3. Are you able to log in and browse the website www.thehunter.com

Your msi file shows error with some system files like ntdll.dll. Try to Download the Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package MFC Security Update that is suitable for your operating System. After installation, reboot your computer.
Download here https://www.microsoft.com/en-us/download/details.aspx?id=26999

After that, please try running an SFC scan - https://support.microsoft.com/en-gb/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system

Let me know how it goes then.

Best Regards,
Ahmed