Hi Dmitry,
Looks like it's a bug. What 747 model is it (doesn't seem like the default ver)? Who is the developer? If it's payware, I suggest contacting them. If it's freeware, well that's another story since XP doesn't have high quality aircraft for free. I recently moved back to FSX cuz XP wasn't working well with my PC. Plus I have quite a bit of addons and currently considering P3D
Cheers,
-Rishi