Hello, my name is Dan.
My home is close to Lake Ontario in New York State in the Eastern time zone, I am generally online between 10 AM and 11 PM Eastern standard Time.
If I do not respond right away to your reply, rest assured that I am not ignoring you, I am probably assisting other customers and/or doing research, I will be with you as soon as I can.
I will continue to work on your problem until it is either resolved or you give up.
The only stupid question is the one not asked. Some may seem silly but never stupid.
Yes, you can but it isn't as easy as you might think.
A lot depends on if you have Time Machine or another backup that has a copy of what it was before the upgrade.
A better solution may be to upgrade Quicken.
This article explains how one person did it, a bit round about but it works.
How to convert an older Quicken data file to use on Mac OS 10.7 Lion | The Best Parts
Or this is where you can get a Lion version of Quicken cheap.
Quicken® Mac 2007 Personal Finance Software - Mac Financial Software
If you still what more help with Lion or reverting to Snow Leopard please let me know.