I already tried setting IP acquisition on the W98 machine as automatic, didn't work.
I don't know, it's my aunt's old PC. I think it's a custom built Pentium 4. On the front panel there is a Pentium 4 Inside sticker, but dxdiag says I have a Pentium 3. Weird.
For the netbootdisk, I assume that it needs a floppy disk. I don't have one of those and the drive isn't working, so I just burned the files folder from the bootdisk zip onto a CD. Then I put my win98 startup CD and booted into DOS, then I put in the netbootdisk CD with the files, and autoexec.bat just gave a bunch of errors. I don't think that's gonna work.
I'm using Windows 98 SE.
I probably know what is the problem. There is a weird situation with the drivers. My motherboard is a U8668-D and version 7.0, it say so on the motherboard. I realised that this mobo has a VIA VT6103, not a RTL 8139. I somehow installed RTL 8139 drivers, and it worked. I think I downloaded those drivers from here http://www.biostar-usa.com/mbdetails.asp?model=u8668. As you can see this is the u8668, not the u8668-d. For some reason now it says that the LAN adapter is RTL 8100B, not a RTL 8139. I uninstalled the RTL 8139 and tried installing the VIA VT6103 drivers from here http://www.biostar-usa.com/mbdownloads.asp?model=U8668 D, but it said "Cannot find proper NIC, press OK to continue. Then I found another biostar site http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=245 Here you can select the version of the motherboard, but 7.0 is not listed! This is definitely a problem with the drivers. I don't know where to download proper drivers.
Like I said, this most likely a problem with the drivers.