Yep I'm on W7 too so that should not be the fault. If you're really sure you're on low and have DX9, copypaste my settings.ini, and edit it what there is in yours :
Code:
[WindowSettings]
Width=1920
Height=1080
Fullscreen=true
RefreshRate=60
VSync=false
[Sound]
Quality=medium
VoipEnable=true
SpeakerCount=0
[Graphics]
Effects=low
Soldiers=low
Vehicles=low
Overgrowth=low
Undergrowth=low
StaticObjects=low
Terrain=low
Shadows=low
Bloom=false
HSAO=false
MSAA=0
Water=low
MainQuality=custom
Texture=low
DxVersion=9
Aniso=1
Detail=low
RenderAheadLimit=2
Fov=55
Change the resolution, though.