HELP - islayer.dll error on ANY Catalyst drivers on PE 400SC

Hi all,

The Catalyst 2.2 through 4.2 packages (as well as the seperate driver & control panel packages) will NOT auto install on a Sapphire 9600 Pro Atlantis under XP Pro SP1.

Halfway during setup, I get an error message stating (error - islayer 0x80040707 etc.).

I can extract the 4.2 driver package & manually install the drivers via Device manager, but I also want to install the Control panel...

What gives? I'd like to try the Catalyst drivers before I start experimenting with Omega drivers...

Clean install of XP_SP1, and the Sapphire Pro 9600 is the only video card I have.

I also have the latest inf files for the chipset/AGP etc., as well as Direct X 9.0b installed.

I then created a brand new additional Admin account, and tried installing from there as well...no go.
Also tried after copying an NT based "islayer.dll" into my Windows/System32 directory - still no luck.

I also noticed an additional error message 'could not find aticim.dll'.

I finally tried Omega Driver v 2522 - still no luck.

System specs-

Dell 400SC (oem PCI card removed)
Intel 875P chipset, using latest Intel INF package
128MB Sapphire Radeon Pro 9600
Twin IBM Deskstar 185GB hard drives
Integrated audio 5.1, latest Dell drivers
Gigabit LOM Ethernet
4 x256MB PC3200
Latest Dell System BIOS
WinXP Pro chipset/AGP drivers + SP1 + all updates/patches + DX9.0b + MMC + NET Framework 1.1