NoisySimmer I've merged your post with another thread about this issue. Please try switching to DirectX 9 mode, or remove the basement windows that look into the pool, and let me know whether either one works.
For reference, please also provide a dxdiag. 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.
