Suse Linux 5.1 under Virtualbox ( Unable to make the network card work)

Hi

Im trying to make S.u.s.e Linux 5.1 work under Virtualbox.

I got X Windows and Gnome2 work 800x600 with decent color depth

The only thing I can not make it to work is the network interface card:

- it shows up as dummy0 interface ( i set static IP for it )
- i tried autoload kernel modules for network card with the boot disk 
but none of them seem to recognize it or load correctly
- in virtualbox I selected PCNet-FAST III (Am79C973)

I also tried to install Virtualbox guest addition tools under Suse 5.1 
but for the moment it complains for missing bzip2 ( i tried a few 
versions 1.0 , 1.2, etc.  but they either give a lot of dependency 
requirements ( packages i again do not have on the install iso like 
bzip2-libs libc.so.6 libbz2.s0.1 rpmlib or simply says Only Packages 
with major numbers < = 3 are supported by this version of RPM

I can not seem to find manuals or admin docs for this version of suse 
linux 5.1 either and packages are hard-er to find as well Vs what I thought.

Thanks

Viktor