Hi,
Thank you for choosing Microsoft Community to post your question!
Based on the above description, it appears that you have issues with FSX game.
I will be happy to assist you.
Refer to the following links:
Troubleshoot graphics issues in Flight Simulator X
http://support.microsoft.com/kb/925722
If the issue still persists, post your question in the following FSX Community.
http://www.microsoft.com/Products/Games/FSInsider/tips/Pages/default.aspx