eth0 won't stay up

[hanfamily at earthlink.net]

> snip
> With a hub replace full with half. I.E.
> 
> > > In the meantime, try "ethtool eth0 speed 100 duplex full" and see if
> > > that stops it.
> > > ----------------------------------------------------------------------
> > > - Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
> > > - VitalStream, Inc.                       http://www.vitalstream.com -
<snip> >
> On a xterm as root;
> [root at localhost root]# ethtool -s eth0 speed 100 duplex half
> (Mr Stevens forgot the -s)
I tried this it still doesn't work right when I ping I lose over
half of the packets and it blinks constantly. The nic is part of the
motherboard along with a wireless conection of some sort. 
It does the same thing on the windows side compaq says it is suppose to 
blink on and off constantly! Should I try using a real nic card.
If so any suggestions on what to use?
                   Thanks
                   Linda