Who said anything about Vista? Vista runs like crap on even high-end intel quad core computers with 8 GB of RAM. That is why Windows 7 happened... Windows 7 runs just fine on my brother's 1st gen netbook (9 inch Acer) and my 2nd gen netbook (Asus 1005 HAB), as well as my brother's 3rd gen netbook (Asus 1015PN with Ion2). I have an Agility 1 SSD, 2 GB of RAM and an n270 (oc'd to 2 GHz). Runs as good as I need it to.
With 1 GB of RAM, 7 runs just fine, and I would imagine that the Z600, even with a lower clock speed, because of the integrated graphics silicon, that the battery life and performance will be just fine for this phone.
The Crysis question is a valid one too. Funny. But Crysis 2 will OBVIOUSLY not work. Crysis 1 might actually. It isn't about being a 'standard', it is about the fact Crysis was horribly programmed, and required some serious hardware to run it, even a couple of years after it's release to be able to take full advantage of the visual goodies...