Blurry images any idea why? please help

Hey guysim getting some wierd blurry images, on AI, some of the downloaded planes and on the taxiway signs...now i know how to fix it in DXbmp, but this take very long...how can i easly remove the mips (creating the problem i think) quickly?note the Delta is blurred so are the SIA's wheels and the taxiway signs.http://forums.avsim.net/user_files/91112.jpgcheersNick