Hello, Hopefully someone has some ideas that can help. I have been running ccleaner for years on my PC's and family members PC's (when they ask for help). I have never had an issue until now. I have an ASUS that I upgraded to WIN10. I ran a scan and cleaned out a bunch of junk. I also did the registry scan. I didn't make a back up because I have never had a problem...till now. I rebooted the PC but now have no internet. I reset the router, ipconfig release/renew, system restore...nothing. I think ccleaner did something. I was looking online and see similar issues but fixes haven't worked for me.
Ccleaner didn't do it, you did by blindly cleaning the registry. Since you made no back-up and likely have no idea what you removed, I'm not sure how to even begin troubleshooting this.
You say you've never had an issue before; this is akin to saying "I've never been bitten by a bear before therefore I can jab this bear with a stick and nothing will occur."
first on my list would be to uninstall your network adpater, reboot and either let the PC auto-reinstall the driver or go to the adapters manufacturer's web site and download the latest driver.