MS' own website on Win8, and the Win 8 Upgrade Advisor program you can install to test your PC for upgradability, all talk about the resolution issue. Its apps and 'snap' (a stupid program for making you able to view only TWO windows, else you're stuck with full-screen) -- these require widescreen resolution. You can get a 16:9 resolution (or better) monitor at Dell Auction or Amazon for less than $70.
MS' new disgusting and dysfunctional websites on Windows 8 make it really hard to find the System requirements page, so here it is (remove the spaces): http:// windows.microsoft. com/en-US/windows-8/system-requirements
Basically, you can run Desktop on a screen with less than 1366 x 768 resolution. In Modern UI, you seem to be stuck with fullscreen. Yet one more reason to say no to Win8.
OH: you don't have to use UEFI, but if Win8 can't turn on the NX parameter, it won't install.
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