Www-searchings.com, browser hijack

Hello.

 Im having major issues with my PC.  I appear to have been hijacked by www-searchings.com on all my internet browsers, and cant seem to find, or remove it at the moment.

 It is affecting both Firefox, and Edge. PC is running windows10..

 Everytime I start either, it defaults to www-searchings.com, no matter what I set my homepage to..

 

 It also appears to be greatly slowing the internet on that PC, and opening random pages while trying to browse.

 Am concerned I have spyware on my system, and am at risk!!

 Any scans, from Norton Security turn up nothing, and searches of the Norton site also turn up nothing, including power eraser.

 

 Im hoping someone here has come across it, and knows how I can get rid of it..

 I am getting extremely frustrated, and am contemplating a complete wipe, and reinstall..

 

Thanks

Derek