Re: before i chop my head off...
Think we need to know a few basics like what operating system you are running, are any firewalls involved, are you using a wireless router or just a wireless card in the back of the main PC.
As above is internet connection sharing in use? Try taking the proxy settings out of the laptop as it is effectively connecting via the desktop if you are using ICS.
Also it could just be an issue with the wireless networking, how far from the main pc are you when using the laptop and have you tried adjusting settings in your wireless card setup?
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