You might want to try to disable apic
But first of all, you shuld be using the 8139too module, right??
Since you are using MDK 9.1, do this to disable APIC. Using KDE, go into the panel, and hit run command. Type in the combo box:
Then, hit the details button and check the run as different user box. Then go down and enter your root password and click run
First back it up, then...
Edit your linux entry that has label = "linux" (it should be the first entry) to include noapic in the append line. There should be some other stuff too, just add noapic before quiet
here's an example:
Be sure to type lilo at the console to activate your changes and reboot
append="devfs=mount hdd=ide-scsi acpi=off noapic quiet"
I've read, however not experienced that the realtek cards are somewhat buggy with apic support
To get a view of all the system messages you might want to try this:
Hope that helps.
Perhaps some other linux guru's
can help you out too