FSX Install Help!

Ive been playin FSX for a while and then thought i would try out the multiplayer, I realised i then had to SP2. I did so but then the MULTIPLAYER tab in FSX disapeared, so i uninstalled it then Im trying to reinstall it but it keeps coming up with this error!!

http://s1303.photobucket.com/user/Josh_McPolin/media/Untitled_zps32b50c76.png.html?filters[user]=135716965&filters[recent]=1&filters[publicOnly]=1&sort=1&o=0