Browsers not working

Hi,
I’m not at all an expert in Linux, basically a functional user. I have an issue after trying to install a virtual OS with Virtual Machine Manager. Tried to install W10 but if fails (don’t know why, may be some KVM files missing). Then when trying to open any webpage on Firefox or even in Chrome a blank page appears even if my connection works correctly. On top of that when I use a VPN connection everything works fine…Does anyone can help me on this ? Thank you