Originally Posted by séamuis 
your processor wont be the issue. (the minimum requirment from Adobe is a pentium 4) your problem will be the memory. most of these atom based netbooks have 1 gig of ram, and this only just meets the minimum requirements for lightroom 2.3.
Good point. I should have noted that I upgraded my MSI Windbook to 2G RAM and 250G HD. Also should have noted that the screen size is less than optimal - you need to set it to a 'virtual' size of at least 1024x768 and scroll around, especially if you want to use ACR...