my wild guess is that you don;t have the righ version as asimCDFS.
1,You should boot with 3.1 install disk.
2,format system: disk
3, launch 3.1 install
(this will give you are super clean install)
4, install asimCDFS unsing the installer in the asinCDFS disk
5, make sure to choose (atapi.d.., not scsi!)
(if the installer can't find your drive.
-make sure its connected right (power and ide)
-make sure the master/slaved setting are correct for your setup..
6, the insall should finish without error.
Otherwist try some of the other CDFS sytems out there, I have used asimCDFS for years no problems.....
make sure you make an emergency disk when you install 3.9....otherwise you may have to deal with this again!
Pierre