I'm not very much a FG expert but I know a bit about Win7 and Win8
In short:
- - avoid installing 32 Bit software under "C:\Program Files" it should go to "C:\Program Files (x86)"
- avoid to use directories "C:\Program Files" and "C:\Program Files (x86)" for anything which needs to write
--> they have a lot of restrictions,
--> e.g. seems in your case terrasync ?!
- Win8 it is even more restrictive and you cannot make these directories writeable (except for setups)
- what adds additional complexity is also the Windows "virtual store" concept which may leed you astray as it "fakes" as if you could write but stores things under something like
"C:\Users\michael\AppData\Local\VirtualStore\Program Files (x86)\abc..."
e.g. FG uses e.g. "C:\Users\michael\AppData\Roaming\flightgear.org"
Mike-DE