To check if the wireless card is bad or OK.
Go to Control Panel - Network Connections - Is the wireless network connection listed and if so is there a red X on this connection?
If so, right click on the wireless and click Repair - this may fix your problem, it forces the wireless router to issue the wireless card with a new IP address.
If it doesn't fix the problem then go to Control Panel - System - Hardware tab - Device Manager - scroll down to Network Adapters and expand and check your wireless card, is it Working and Enabled?
If has a yellow ? against it or not working then reinstall the wireless card driver.
If the wireless card is built-in check the BIOS to see if the wireless card is enabled, if not enable the wireless card and repeat the above steps.
If this doesn't fix your problem then the wireless card is faulty and you need a new wireless card. You can get a PCMCIA wireless card to replace the faulty wireless card. If the wireless card is built-in then disable the faulty wireless card in the BIOS before you install the new wireless card.
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Is the wireless adapter showing up in the device manager?
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