I have Windows 7 Professional 64bit (C:\Windows) and FSX on a separate HDD (J:\Flight Simulator X). The installers should know where FSX is installed, unless you moved it to another HDD/partition without changing the registry.

There is no support email address. All official support is done using the Ticket System.

Are all the other gauges in the VC visible (no blacked out)? Does the 752 have landing gear (landing gear is not missing)?

Is you FSX FSX with SP2 or FSX with Acceleration? Depending on that answer, maybe you should do a repair of FSX and reinstall SP1 and SP2. OR. Do a repair of FSX and a repair of Acceleration. It might be that FSX is the problem and not the Captain Sim 757-200 Base Pack installation. This would especially be the case if the landing gear IS visible and the other gauges are NOT blacked out.

As far as I can remember, FSUIPC is no longer a requirement for the 757 Captain.