Well try these...
1) Do the above post.
2) Restart computer
3) Uninstall then reinstall soldat 1.4.2
4) If those don't work... try it minimized
5) maybe get new drivers for your video card
6) maybe get a new video card
7) if all else fails go to your desktop, right click, go to settings(or what ever it is to change the screen size for your desktop), and change the 32 bit rate to 16 bit rate...
the last one 7 worked for some odd reason when i had the problem but it went away with a new graphics card...