On a personal note, I had wireless connectivity issues after upgrading to Windows 8.1; the operating system would not recognize the 5 GHz spectrum. To fix this, I did the following:
Downloaded and installed the adapter's latest drivers
Entered "Network and Sharing Center"
Clicked "Changed Adapter Settings"
Right-clicked on the adapter in "Network Connections" and its "Properties"
Clicked on the "Configure" button and clicked on the "Driver" tab
Chose "Update Driver," "Browse My Computer" and then "Let Me Pick…"
Here there should be two drivers: the Windows 8.1 version and the new ODM drivers
Chose the ODM drivers and suddenly the 5 GHz network appeared
Granted, this won't help everyone, as most of the problems listed in the thread seem to be Intel Centrino related. Still, this seems to be an ongoing issue, with suggestions including installing an old driver, disabling Bluetooth to changing the channel in the
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Open the Network troubleshooter by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering Identify and repair in the search box, and then tapping or clicking Identify and repair network problems.
If running the Network troubleshooter didn't solve the problem, then follow these steps:
Make sure all cables are connected. For example, make sure your broadband modem is connected to a working phone jack or cable connection, either directly or through a router.
Remove the power cord from the modem and router.
After all lights on the devices have gone out, wait at least 10 seconds, and then plug the modem and router back in.
Some modems have a battery backup that prevents the lights from going out. For this kind of modem, press and quickly release the reset button. If you don't see a reset button, remove the battery instead.
If you're setting up a new PC for the first time, check if your router is fully compatible with Windows. Because of the new networking features in Windows, some older network routers aren't fully compatible and can cause problems. For a list of routers that are compatible with Windows 8.1 and Windows RT 8.1, go to the Windows Compatibility Center.
Make sure your router and the network adapter in your PC will work together. To work, the network adapter in your PC must use a wireless standard that is equal to or older than the router's wireless standard. For example, if the network adapter in your PC uses the 802.11n wireless standard (also called Wireless-N) but your router uses 802.11g, (also called Wireless-G), you won't be able to connect because the Wireless-G standard is an earlier version and doesn't recognize Wireless-N.
However, if the router uses Wireless-N but the adapter in your PC uses Wireless-G, you should be able to connect if the router is set to mixed mode, since Wireless-N works with some or all of the earlier standards (802.11a, 802.11b, and 802.11g).
