Yes, you can reinstall Windows 8.1 if needed.
Yes, you can reinstall Windows 8.1 if needed.
The PC will soon only have an HDD. If I put Windows 8.1 on the HDD first and then switch to an SSD later, can I reinstall Windows 8.1 using the same disk and optical drive again?
Ensure you use the same hardware during reinstallation, like your motherboard.