Program Startup

[Mike C.]

All of a sudden I can't open the GnuCash program.  I am using version 
2.2.9 with Windows XP SP3.  It was working fine yesterday and the last 
thing I can remember doing was setting up the download for a credit 
card.  Now when I try to start the program from either a shortcut or 
going to the gnucash.cmd file it flashes a DOS command line screen for a 
fraction of a second to fast to read and then nothing.  I tried 
rebooting the computer with no change.
I have a lot of data entered and would sure hate to loose it.  Any 
suggestions what might be causing this?
Help!
Mike