Just looked it up... and since it's basically everything but a laptop, I'm affriad you're stuck. Don't think hardware render will do much at all, so software is about all you have as an option. Tablet pc's are mostly just... well... they're not really for gaming from what I've seen.
Only thing you can pretty much try is to upgrade any drivers on your tablet pc, but seeing as FF8 is about 6 years old, I'm afriad I don't have much hope for that.
A third option is perhaps you'd have better luck spending $10 on a PS version (even if you don't have a PSX), then ripping it to a ISO and running it with ePSXe or something. Check out the forums at NGEMU if you have questions about the PSX version. Trust me, FF8 is one of the most asked PSX games there (along with every other FF game, Chrono Trigger and any Square game out there for the psx), so finding any info about it won't be hard.