Get rid of a MAC address in a wireless net work when connecting to another router

I have a cmputer that was taken for the weekend and they connected to another wirelesss system What it was brought back i can not get connected to my wireless system.

THey had to put in a code to get onto this network. I have a Linksys wireless router with not secured.
I need to get back on the homenetwork here.
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Simple way is uninstall and reinstall, then configure the wireless card again.

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PdetersAuthor Commented:
will try that
PdetersAuthor Commented:
I like simple - Thanks
You are very welcome.
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