Snooker,
Much appreciate your link to that above website, but I sorted it.
I did a networking test using PC Doctor.
It showed me that the LAN Card failed a TCP/IP test.
I uninstalled the drivers & reinstalled, this made no difference, so I downloaded new drivers from Intel and it worked fine?
The other PC connects to this one fine and vice versa, very strange and clearly the last resort to fix my problem, but thanks for ya help in the meantime!

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Happy to help with Windows 95, 98, ME, XP & Vista. Any router issues are also welcome