PlayOnLinux might help
I've also got a netbook with Windows 7 home (very) basic.
I resized Win7 to a small partition to make way for Ubuntu to be installed.
Orbiter is the only Windows application installed on Win7. (Uninstalling the junkware took a long time)
Orbiter 2010 runs OK in a small...
Is your nvidia driver working OK without Wine ?
(I am a Ubuntu user - sorry I can't try to replicate this problem)
It looks like the problem shown here...
http://www.nvnews.net/vbulletin/showthread.php?t=89965
What count do you get when you run glxgears ? (You may need to install mesa-utils...