The Internet is such a big part of using a computer that when you run into network trouble, you'll want to pull out your hair (assuming you have hair).
Run a firewall.
There’s no need to run multiple firewalls. A single hardware firewall on the router works best. If you don’t have one, run a software firewall.
Share folders on the network in Windows 7 and Windows Vista by using the Advanced Sharing button to access the Sharing tab in the folder’s Properties dialog box.
When restarting the network, turn everything off. Then turn on the modem, the router, any switches, and, finally, the PCs attached to the network.
Ensure that the wireless NIC has been enabled on your laptop; check for a small switch somewhere.
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Source:http://www.dummies.com/how-to/content/pc-network-troubleshooting.html
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