Mac OS X Tiger and Windows XP Pro conflicting?

Hi,

I have a wireless network at home, and all the computers connect via
WiFi to the 3com router. All of the PCs are fine on the network, apart
from one - and Acer desktop with a Belkin 54G USB Adaptor. It works
fine normally, until I got my Mac. When my Mac is on and already
connected to the router, the Acer PC appears to connect OK (obtains an
IP via DHCP and shows 'Connected'), but cannot access the internet or
fileshares or anything, local or remote. It will not even ping the
router. When i try an 'ipconfig /renew', it just times out. The Mac is
fine through all of this.
If the Acer PC is on first, it will continue to operate perfectly when
I turn my Mac on. But the Mac gives: 'Error joining the AirPort network
"XXXXX"' when I attempt to connect and until I turn off the Acer desktop
and restart the router it continues to give that error on trying to
connect to the network. It has completely baffled me and I haven't got
a clue where to start looking for a problem. I have tried a factory
reset of the router, which doesn't help, and I have tried all the
securities possible (WEP,WPA,Unsecured). Please help, it has driven me
to breaking point! It is an old router, and I am prepared to buy a new
one, if necessary.

Thanks for your help in advance,

James Melling

Proud, but confused new Mac owner

PS. Do you think it might be due to all the other PCs having Windows XP
Pro SP2 which I have bought separately and the Acer having preinstalled
XP Home?


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jmel