Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

With the Stormblood expansion (4.0), there was an increase to the minimum requirements of the game. It looks like the graphics cards in both PCs don't quite meet the minimum requirements for that expansion, even if it met the requirements for the base game.

Unfortunately, this can make troubleshooting a bit more difficult. The solution may end up being to upgrade your hardware. However, you may want to try some of the following to see if it will alleviate the issue:

1) For your second PC, the graphics drivers look a bit out of date. Try installing the most up-to-date versions. You may want to try reinstalling the drivers on your first PC as well.

2) Set compatibility mode to Windows 7. Right-click on the ffxivboot.exe file and select ‘Properties.’ Then select the ‘Compatibility’ tab and choose Windows 7.

3) You can also try a clean boot. Simply open the task manager and select the 'Start up' tab. Disable everything here and restart the PC. This will make sure that no background processes are interfering with the game.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!