Hi, I might be able to help you a little bit.I haven't had the same exact problem with Family Tree Creator Deluxe, but I do know what "memory" is and might be able to help you figure out how to free some up to at least get your file converted to a gedcom file and then try some other program.
Memory is the same as RAM.It is what is being used when the computer is turned on.All your programs that you have open now and running are using RAM.Your harddrive is what stores your programs and files when the computer is turned off.To free up memory or RAM you have to turn off as many things as you can that might be being held in RAM waiting to go on or be used.An example of one thing would be to turn your screensaver completely off so it is not waiting to go on.If you have any other programs on, shut them down.If you have anything running in the background, such as a virus scanner or firewall, temporarily turn those off.(Don;t forget to turn them back on later)Turn off any photo or design you have set as the background picture on your desktop.If you are not sure how to turn any of these off, please feel to say so and I will try to help you figure it out.I am not sure which operating system, Windows, you are using, so there are different ways to check on what you have up and running.Try doing CTRL-ALT-DEL just once (twice restarts your computer) and you may get a list of programs that opens up.Shut as many down as you can.Then try and open your Family Tree Creator Deluxe file.
Another option is to buy more memory/RAM or try it on a different computer which has more memory.Install your program there and see if you can open your file.Your .CGF file may have gotten too big to be opened by the amount of memory you have.
The minute you do get it opened, save it as ("export" it to) a GEDCOM file, then you can open it by newer versions of almost any newer genealogy program, as this is the standard now.You might lose some things, such as photos (which I am now learning the hard way) but it should have all your important info.Then you can also look into getting a newer program to work with.Mindspring is no longer in business, and Broderbund (who bought them out) doesn't really offer much support.
Hopes this helps.Feel free to post to me and I will try to help you as much as I can!