I installed the Windows 8.1 Preview and now my "802.11n Wireless LAN Card" does not show any wifi signals to connect to. I have it hooked up with an ethernet cable right now which works fine. It also uninstalled my Avast antivirus. The last thing to uninstall my antivirus and disable my internet was a malware.

HP Pavilion p7-1414, AMD Quad-core, 6g RAM, 802.11n Wireless LAN Card

same problem here. no wifi signals at all.

Have you tried to reinstall the Windows 8 WIFI drivers?

same here  reinstall did nothing

Any news on this ? I have the same problem here !

Just instaled it too, no wireless, mine is a Toshiba

Satellite P870/026

Just go to Control Panel > Network and Internet > Network Connections and re-enable the Adapter.

It won't let my wifi card start code 10. Tried reinstalling the drivers and still no go

Same problem. 

It is supposed to uninstall the antivirus and leave Windows Defender to do security. I will assume then that it is intended to disable the wifi. I did not see any warnings about this pre-install.

Same problem - no WiFi signals. I attached a router configured as a client to access my wireless network. While configuring the client - the internal WiFI started working! After rebooting - WiFi gone again :(   My guess is it has something to do with the new Wireless Hotspot features predicted to be in the final version.

Same here! Wifi is now working in my Lenovo, it gives me error 10. I tried reinstalling the drivers but they're up to date.

Same boat here with my Toshiba. Realtek adapter is enabled and up to date but nothing until I plug it in to LAN. Hoping they come out with a patch really soon since I like the new features

Same problem with my SurfaceRT.

IT sees no net or claims password is invalid even if i try to connect to an open net. 

It worked perfectly with 8.0 and other devices can connect so in my case it's the surfaceRT or 8.1 that is the root of the problem

Having issues with my surface pro not wanting to stay connected.

same here.. no wifi network found

I have same problem on HP except when i try to disable and re enable my card it locks my notebook up. Upon reboot it does same thing over and over.

Same here, i tried enabling the adapter in Control Panel > Network and Internet > Network Connections once i click Enable, it first says Enabling followed by Enabled. But it still wont enable it even tho it says that it does...

Same, Realtek RTL8192DE wlan card. Go to properties in device manager. Find this under device status.

"This device cannot start. (Code 10)

{Operation Failed}
The requested operation was unsuccessful."

un-installed drivers, installed latest from realtek website. still nothing.

From Cesar Mello (http://answers.microsoft.com/en-us/windows/forum/windows8_1_pr-hardware/no-wireless-networks-after-upgrade-to-windows-81/c9223bef-cd2e-4098-bdd2-34f8f8f70ac2?page=2)

"I own a Lenovo G470 and my problem is solved.

Device manager was showing I had a Realtek wireless lan driver facing a startup error. I tried updating the driver even with a LAN connection working but had no luck.

Then I downloaded the latest Realtek/Atheros bundle drivers from the Lenovo support site, installed them and still no luck. The driver shown in Device Manager seemed to be the same that was installed before and still not working.

So I tried to update the driver choosing the Browse My Computer for Driver Software / Let me pick a list of device drivers. It showed three options: Realtek driver, Microsoft driver and Atheros driver. Tried each one, as soon as I chose the ATHEROS driver the wireless lan icon appeared and everything started working!

I hope this helps someone.

Now my Windows 8.1 notebook rocks.

Best regards and thanks for the help!

Cesar"

fixed my problem

This worked for me too,

I have a ASUS PCE N53 card and i had to choose "802.11n Wireless Lan card (Microsoft) to get it to work.

please can u provide with images so that it could be helpful to me

it works now thanks dude

Yea, that worked for me too.

Control Panel - Hardware and Sound - Device Manager (Under Devices and Printers) - Arrow in front of Network Adapters - Right click on your Wireless card - Update Driver Software - Browse my Computer - Let me pick from a list - Pick a driver you think Microsoft is going to like, and if it doesn't work go back and pick a different one.

I also - LG N460 notebook (RTL8723AE), desktop motherboard intel wifi usb DG965WH (ENCORE ENUWI-N3) and (chip Intel 82566DC Gigabit Ethernet Controller)
DESPERATE

OBS.: I've managed to work with internet wifi usb tp-link TL-WN821N

works here too

I had a same problem. ... wat i didi wass goto Device manager and disabled LAN Ethernet device..

And Bingo.! It worked... :-) 

Hey guys. Device manager, click on wifi card,uninstall driver, right click at top to scan for hardware drivers and bam. Worked for me on hp dv7 4180 sf,as I was having the same issues:) 

Thanx Dude..... it worked for me to. now my 8.1 rocks............

Hello Guys had the same problem and I've been searching the internet behind the solution, I finally found the solution to my Notebook which is a Itautec infoway note N8510 and uses the wireless network card Realtek RTL8723AE the solution was as follows:
1 - Device Manager
2 - Network Adapters
3 - Select the device related to your wireless card
4 - Click the Right button on the selected driver and Click Update
5 - A window appears, click the Browse my computer for driver software
6 - You will see another window, click let me choose a list of device drivers on the computer and displays a list of available drivers select another driver in the list
7 - Click Next and go!!
Now make sure you are capturing wifi networks
this was the solution I found to my computer using windows 8.1 upgraded the store!

Solution found by a Brazilian student of computer science

I also do it, but still will not run on my wifi.

From Cesar Mello

"I own a Lenovo G470 and my problem is solved.

Device manager was showing I had a Realtek wireless lan driver facing a startup error. I tried updating the driver even with a LAN connection working but had no luck.

Then I downloaded the latest Realtek/Atheros bundle drivers from the Lenovo support site, installed them and still no luck. The driver shown in Device Manager seemed to be the same that was installed before and still not working.

So I tried to update the driver choosing the Browse My Computer for Driver Software / Let me pick a list of device drivers. It showed three options: Realtek driver, Microsoft driver and Atheros driver. Tried each one, as soon as I chose the ATHEROS driver the wireless lan icon appeared and everything started working!

I hope this helps someone.

Now my Windows 8.1 notebook rocks.

Best regards and thanks for the help!

Cesar"

fixed my problem

Selecting the Atheros driver manually completely solved the problem for me.

Thank you!