Well this has taken a while to work out where my issues are coming from.
A couple of months ago I was having issues with my internet provider, it was running extremely slowly, over this the same period I built a new PC. The provider fixed the issues in my area and all of the other internet capable devices in my house went back to normal with the exception of my new PC.
When I switch the PC on, the VPN will connect with no issues and my network ports are connected, however opening a web page, running Steam or any other online service can take 10 minutes, and sometimes not at all, to connect. On top of that the internet connection will drop out frequently. Obviously I thought it was my new motherboard as the other 3 PC's and 1 laptop in my house all have Norton installed and are having no issues.
This evening I tried disabled Norton Firewall, not something I want to do leave my PC without, and any and all internet connections issues immediately stopped. Web pages open instantly, as they should with a 1gb connection, Steam runs without issues, I even checked my daughter's Genshin Impact account, no issues there either. I re-enabled the firewall and all internet connections went down again.
I disabled internet cost awareness on the Firewall settings as that seemed like the obvious one but it didn't help. What other settings could be causing this issue?
Sorry for the long post and thanks for any help