There is a mimimum resolution requirement to run Metro properly. I recommend full 1080p graphics. You may also want to make sure you have the latest version of abode flash player. I am testing in on my older computer, which had 32b Vista.
MB-Intel DG35EC Graphics 720p (should be 900p for metro)
CPU-E7200 Core 2 Duo, 2 Gigs of DDR2, hd seagate 360gig