Very pleased with 777 however I'm getting frequent skeleton effect (aircraft with no skin or walls), I am using hi end PC with digital HD and 6gig of memory.     In researching forum, seems that several users reported similar issues, solved by re installing FSX sp2 and or Acceleration.  I want to do same,  is it best to uninstall previous install in my case Acceleration then install it again,  or just install over old install,  Will this process harm any installs or 3rd party aircraft or sceneries, which I have,  would prefer not to have to reinstall completely FSX with all add ons.   Advice would be appreciated, thanks,

Double post, sorry,