interpolated
Windows 8 isn't the best really.
Agreed. However, Window 8.1 is perfectly fine. If he is on 8.0, that could very well be the problem, and he needs to upgrade to 8.1 (it's free) and install all the available updates.
If you meant Windows 8.1 is not the best, then that is not helpful. As long as the OS is still supported, it should work fine and wouldn't be causing the issues that he's describing.