I have been facing shutdown and restart issues since upgrading to 8.1. The laptop is not shutting down or restarting for long time then I have to use power button. I have updated all hardware components after the upgrade which includes graphics card drivers from Intel website. It runs fine for few occasions, if I turn off and turn on hibernate. I have even disabled fast start. If things don't workout then I will be forced to downgrade.
I think it would be ok but it says "Windows XP, Windows 2000, NT, Windows 9X, Windows ME or a MS DOS environment." so might have to use backwards compatibility on it (not sure if that is a good idea?). I would back up everything before you upgrade in case the worst happens. Maybe run some hard drive tests perhaps the HDD is on the way out? Was it fine on 8.0 to clarify like you said? Also is everything support in 8.1 in the bios? http://windows.micro...-is-pae-nx-sse2