Many thanks to both of you.
lthendrix the reason I want to reinstall is to start fresh from all the clutter that I have piled into fsx like the freeware airports and planes that seem to be slowing it down, I will try the fixes first, Thanks.
iSamage I see what you mean now, If PMDG has sent me a fixed cfg file then that file is good to go if I keep a copy and then replace the default one should I end up reinstalling, Thank you.