C3DModel::Load-can't open error

After cleaning out my data folder, I had over 1200 folders in it. I obviously over did the cleaning out, so now when I try to load the TRI Hd SFO and others,I get the following error. At the moment I have very few airports loaded,maybe 7 0r 8 that were producted by our talented crew we have in the Fly II family.C3DModel::Load-can't openBG50543,SMBFile:smodel,CP Line 3704I am in the process of reinstalling the Airports I like and this error will come up on those airports that have models on them,so I feel sure I deleted andor have not yet reloaded all the proper files in the data folder andor scenery shared files folder I need to get back on track.I would appreciate any advice and instruction I can recieve on this problem. Thanks loads for your previous info,I just got carried away with the delete button. I was trying not to have reinstall Fly II.Phil