This error is usually related to the antivirus software reacting at the updated files.
If you use any antivirus, try to *temporarily* delete it, restart the system and check if the issue persists.
If it does, try to perform a clean boot of your OS (https://support.gaijin.net/hc/en-us/articles/200070041) and check the game again.
If nothing above helps, please create a Support ticket and attach your Tasklist file(https://support.gaijin.net/hc/en-us/articles/200488661)