kernel 2.6.20-16-generic won't boot

[Van French]

I just installed Ubuntu 7.04 as a dual boot with WinXP.
After I did the software updates, I see two kernel options: 
2.6.20-16-generic and 2.6.20-15-generic.  16 is the default, and it 
won't boot.  It goes to a black screen, says "Setup" and blinking 
cursor, but nothing happens.  If I choose 15, it boots up and everything 
seems to be fine.

Is there a way to fix the .16 version?
Or,  if the .15 will work just as well, can I make it default?  How?

Thank you

Van French
address@hidden