No internet connection when the Working Group has changed.

I changed the workgroup from my XP machine the same as my Windows 7 computer so that I could have access to a printer, restarted, and now I can't access the internet.

I changed it back and still no access.
I use McAfee firewall and have checked all the settings, turned off the firewall and no change. (It is back on again)
I have connected to another network wifi locally and not always no connection.
I can ping my router and Windows 7 computer.
What happened and how can I get it back?

A big thanks to all respondents, he sweat finally it was McAfee which was causing the problem, it just took McAfee four days to notice there is another pc on the network and him to be confident!

Tags: Windows

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