Error no. 15: Cannot open file. Check if drive is installed

I just installed Ghost 15.0, did a drive image and created a custom recovery CD.

 

Since doing that, I keep on getting a pop-up message:

error no. 15: Cannot open file. Check if drive C: is installed.

 

The pop-up does not say which program is generating the rror message.

 

Does anyone know if it's coming from Ghost, is due to Ghost, or what can be done to have it stop occurring?

 

Thanks,

DavidH