Taszman, you need to post your computer specs for people to be able to provide you with help. However, I had this problem before as well. If you are running an older vid card you may have your resolution too high in the video settings in AH
I would recommend that you try setting your video settings at 800X600, also use 16Bit, check the boxes labeled "Disable Palettized Textures" and "enable Mip Mapping".
You will have to be patient and move the cursor onto Video on the start up clip board. Its slow and a pain in the butt, but you can do it.
And, if this is the problem, you should think about upgrading to a better Video card.
Lastly, again ...post your computer specs.
Cheers,
RTR