My Wifes laptop wont boot up.. It gets a message "Operating System Not
Found"

I notice in BIOS it says:
Primary IDE Adapter [None]
Secondary IDE Adapter [CD Rom]
Legacy Floppy Drive [Enabled]
etc

Under power it says These Settings not effective under ACPI mode.

Boot Order is
CD Rom
Removable Devices
Hard Drive
Network Boot

I got Knoppix to run but Knoppix didn't see the harddrive (no file system)

Now it wont boot with Knoppix.

It happend at the same time as the main PC was infected by a (removable
drive spread) Kavo Virus...

Can anyone suggest a step forward?
Thanks a lot
John