I have a 1-yr old Sony VAIO laptop, and its WIRELESS internet connection capability is completely gone. It says, "No networks available" when I try to connect. I know that is not true! My wireless router is working fine.  When I go to Start > Network > Network and Sharing Center > Manage networks , it says that my wireless connection is disabled. Weird! So I TRIED enabling it, but that didn't work--it remained disabled.

This problem happened in the past several times, but each time I restarted the computer and everything would be OK. But today, I already restarted 5 times and the problem is still there .

I know that
1) my wireless router is okay because I could connect to it in the past (before this problem occurred today) and I'm CURRENTLY connected to it on my other laptop...where I'm writing right now
2) my wireless button is turned ON

Any ideas?

Thanks for any help. Have you tried....

another wireless network?

Reloading the drivers on your machine?

Is there an external switch that might have been accidentially switched off?Spoiler is on the right track with this. First, download updated drivers from Sony for your wifi card. Don't install yet though. Restart and enter BIOS settings. Check your BIOS settings to ensure that wireless is enabled. BOOT into windows and install drivers. If it doesn't prompt to reboot, do it anyway. If, after you've done that, your wifi-power switch is on and its still not working, I would GUESS your wifi card is toast.