Operation Flashpoint
 

Having played this great game i found that the uniform that the sniper i was playing as, had white papered or cardboard box pieces instead of leaves and branches etc

anyone with any ideas

Newest drivers for all components?
32bpp instead of 16bpp (Flashpoint is made for 32bpp) ?

Try playing around with the Preferences-Exe, there are lots of options which impact speed/quality.