My laptop was automatically updated to windows 10 last July and I hate it. My computer does not automatically connect to my wifi any longer.

http://www.techradar.com/news/software/operating-systems/how-to-downgrade-from-windows-10-to-windows-8-or-windows-7-1300286

How to: Rollback to a previous version of Windows from Windows 10
https://techingiteasy.wordpress.com/2015/03/24/how-to-rollback-to-a-previous-version-of-windows-from-windows-10/

If needed :

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For the wireless issue :

Connectivity <-- troubleshooting methods
http://windows.microsoft.com/en-us/windows-10/connectivity

Wired and Wireless Network Problems <- set the down arrow on right of page
to Windows 8.1 which applies to Windows 10
http://windows.microsoft.com/en-US/windows/network-connection-problem-help#network-problems=windows-81&v1h=win81tab1&v2h=win7tab1&v3h=winvistatab1&v4h=winxptab1 
 
Your router would be suspect here, have you updated its firmware as a possible
solution? The router can be the issue even it other OS's are working fine. And
I would update your WiFi drivers on the computers. 

Try actually updating your driver :.

Control Panel - Network - write down make and model of Wifi - double click
on it - driver's tab - write down version - click Update Driver (may not do
anything as MS is far behind certifying drivers). Then Right Click on Wifi
Device and UNINSTALL - Reboot - this will refresh the driver stack.

Then check the System/Motherboard Maker's Site and that of the actual device
maker (such a RealTek, Broadcom, or Atheros) for even newer drivers.

Manually look at manufacturer's sites for drivers - and Device Maker's sites.
http://pcsupport.about.com/od/driverssupport/ht/driverdlmfgr.htm

Download - SAVE - go to where you put it - Right Click - RUN AS ADMIN.

You can download several at once however reboot after you install each one.

After looking at the System Maker's you can check Device Maker's for even
newer versions. (The ones from System maker become your fallbacks).

Windows 10 - Help & Support
http://windows.microsoft.com/en-us/windows-10/support

Windows - 10  - Search Support
https://www.microsoft.com/en-us/newsearch/result.aspx?q=windows%2010

Hope this helps.
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Rob Brown - Microsoft MVP <- profile - Windows Experience : Bicycle - Mark Twain said it right.