I have just installed Captain Sim 757 base pack (download version) into FSX on my Windows 7 computer.

FSX has the accelleration pack installed and the captain sim installed ok but the aircraft callsigns are not read out or shown in the ATC text.

The callsigns appear in the dropdown menu when selecting an aircraft.

For example instead of ATC saying "Speed Bird 757 heavy" all i get is "757 heavy"

I know this is something with my computer as my daughters boyfriend installed it on his windows 7 computer and it all worked perfectly ok.

The usual attempts of reinstallation made no difference.

Please help

I forgot to mention, it works perfectly ok on my Vista computer but i don't want to use the Vista computer for FSX.