Trying to install usair express and usairways express, but keep getting error message "Aircraft.cfg could not be opened" and install closes.Can anyone help me fix this?

Are you installing while FS2002/2004 is running?

No I am not. And Im using FS2004.

Did you rename the folder in the aircraft directory after installation? This would be one reason the installer cannot locate the file.

No I have not. The installer starts intalling the livery but when it gets to the modifiying the aircraft.cfg it says it cant open it and it quits.

Check if the aircraft.cfg somehow has been turned to read only..

It has not been turned to read only.