Squint hard and you can just about make out that this is Windows 7 Ultimate running on the Viliv S5's 4.8-inch screen. After all, we've already seen how the new Microsoft OS runs on netbook hardware and on a UMPC; now it's the MID's turn. Arch-upgrader jkkmobile has done the honors, and the good news is that it's a relatively straightforward install process.
Video demo after the cut
As you might expect, you'll need a USB keyboard and there's some driver shuffling involved, but Viliv have catered for Windows 7 users well and, when everything is completed, there are no glaring issues with hardware. Overall performance is "decent" though not excellent, but perhaps that would be too much to hope for from the S5's 1.33GHz Intel Atom Z520 processor.
In fact the biggest problems come from Microsoft's end, and some of the decisions they've made regarding touchscreen drivers. IE8, for instance, won't let S5 users scroll anywhere on the screen using the hand tool as the Viliv doesn't have the correct touchscreen drivers; the same problem shows up elsewhere, too. That, unfortunately, is up to Microsoft to fix and not really something for Viliv to address, but I imagine we'll hear more voices raised in protest as more users install Windows 7 on existing hardware.