Quick update :
After uninstalling Intel Proset, and uninstalling the wifi driver, restarted my computer, it worked for about 30 minutes after, without me having install Intel Proset again. Once it stopped working, I reinstalled Intel Proset, and now it keeps connecting and disconnecting, all the time. It stays connected for about 15 secondes maximum...
My computer also has WiFi-issues after upgrading to 8.1. Under Windows 8 everything was fine. I have a 4965AGN.
I posted more Infos here:
and also on this forum:
Irwi, I replied in the thread you created. Your wireless adapter model is different.
Vincenttbt, uninstalling the driver from device manager usually has different effect.
You may also try resetting the TCP/IP stack. Open cmd as administrator and run the commands below, then restart.
Netsh int ip reset
Netsh winsock reset
For Windows* 8.1 we have this newer driver: https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=23258