There is no need to reinstall anything.
The PowerFlyer aka FastATA comes with its own drivers. IDEfix is of no use for it.
If you didn't use a 060 before, you should install the new libs *before* you put the accelerator in. Because if you try to run the original 68040.library on a 060, SetPatch will crash with a yellow screen.
You might also want to move the CD0 file from Devs/Dosdrivers to Storage/Dosdrivers before you disassemble your Computer, because the unit number of your CD-ROM drive might change, so you need to edit the file.
Bye,
Thomas