You might want to try...
by Zouch - 3/16/13 4:55 AM
I googled "Kodak Z915 Win7 Driver" and got quite a few links. Most, sadly, lead to the "No longer available" page. However, I did come across this one
which seems to have links to drivers for various versions of the Z915. You might want to follow them up, some state compatibility with Win7, some not. Hopefully your version will have a driver. By way of experiment, I did download the first in the list and it seemed to come down OK.
There are other links from the Google search but you'll have to follow them up yourself.