Honestly, I think I have the most low end computer that is running windows 8.1. First and for most, it is a notebook pc (laptop mini), and half the hard drive was infected and wiped out. However, im still able to run gta iv w/ 24-26/202 mb. And trust me, it is a lagging queen. But since it is a laptop and all, i just stop charging it, and it runs smoothly. Not talking about specs, if my laptop is capable of running gta iv w/ lcpdfr and other scripts at the lowest possible settings, it is most likely yours can to. ;)
Still fun though