CTD Wilco Airbus series both FSsims

Have the different Wilco Airbus series installed in both FS Sims. However I get an error when I changed from one aircraft or texture to another.The programme then stops working.It also happens when I change to a none Wilco aircraft. There is a topic on the Wilco site on how I may get around this, something about full rights etc.However being not very advance in computers and Flight Sims it seems very complicated. I do not want to re-install my Fl. Sims, or damage my PC.When installing I ran as Administrator, including the textures.Have the FL. Sims on a second HD.No other aircraft payed or free has this problem.New PC Windows 7 Home Premium 64bits FS9 FSX.Old PC Windows XP FS9 ( Specs. not good for FSX).As far as I can remember I did not have this problem on the old PC.I will be grateful for any advice, or if anyone else has had this problem.