Wobbly,
You will need another copy of Windows XP if you wish to upgrade the
Win98 computer. Depending upon the resources of the Win98 computer
(cpu speed, memory, hard drive capacity), you may or may not be happy
with an upgraded operating system. Windows XP runs best on a computer
with a faster cpu and more memory than Windows 98 does, and
Microsoft's stated minimum requirements are a bit optimistic.
The Windows 98 operating system is reaching the end of its supported
life with Microsoft. Please be sure to update your Windows 98 with
all the latest patches from Microsoft, as many patches fix security
defects, and unpatched computers connected to the internet are causing
trouble for everybody.
If your new (used) computer is capable of running Windows XP, you may
wish to upgrade. If and only if you have a copy of the original
Windows 98 install media (floppy or CD), you may be able to purchase
an upgrade install of Windows XP. Otherwise, you should purchase a
full install.
How are you networking your current computer and your new (used)
computer? What do you want to do with your new computer? Both of
these questions are relevant to any advice regarding what network
setup to use.
Windows 98, by default, uses the Netbeui protocol. If you just want
to connect the two computers and share files, then you can enable
Netbeui on the Windows XP computer.
Do you intend to share files and access the internet from both
computers? If that's your plan, then you need to enable TCP/IP, and
Netbios over TCP/IP, on Windows 98. For convenience and security, I
recommend that you not do this without connecting both computers to a
NAT router.
Please post back with some more details about your network, the
capacities of the new (used) computer (cpu speed, memory, hard drive
capacity), and what you wish to do with the new computer. We'll give
you all the help you need.
These websites have tutorials which may help:
http://www.cablesense.com/
http://www.homenethelp.com/
Cheers,
Chuck