lulumisya Sorry for the late reply; it looks like your thread was moved to this forum after the fact and was buried under newer posts.
Does this happen in a new save in Sunset Valley? Please test for comparison's sake and let me know. I'm not saying you need to abandon your main save, only that it's useful information. And please list the world you've been playing in as well.
I'd also like to see a dxdiag, for reference. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.