Morning, Dave;
I finally removed the DSS and CMOS battery, cleaned the drive with factory software and reflashed the BIOS.
Reinstalled everything, OS from factory disks and nothing else, no usb drives or SD cards.
So far, all looks good. Scanners that detected IAT hooks, no longer find anything. We may
have , finally cleaned this machine!
Thanks for all your time and effort, Dave. I'll let you know how it goes.