I've just tried the demo to see if SSE will run on my PC and although the frame-rate is enough on low settings, there is something seriously wrong with the texture rendering. Ship Simulator 2008 works fine.
The specs of the computer are:
Windows XP
Core 2 Duo 2.4GHz
4GB RAM (only 3GB available on XP)
Nvidia 6800 GS (I going to upgrade this soon, probably to a GTX 550 Ti)