ELI5 and alzhao thank you for the replies.
I done the reset and then connected to the MT300n and the laptop as i can use the pc to check the forum.
It connected and i got as far as putiing in the openvpn files from PIA when i just kept getting error connecting or something like that.
I left it 15mins and when i came back it had disconnected from the MT300n and i couldn’t get any internet from it but on the pc it was ok.
I retried 3 more times and got the same result.
I can’t try the pc as it doesn’t have wifi and if i plug the cable into the mini router there and then to the pc there is no inernet as i use homeplugs which then connect to the homeplug downstairs next to the ISP router.
When i did connect it yesterday i noticed that i had 2 internet access 1 for my ISP SSID and 1 inidentified which turns out to be the TAP window adaptor V9 if that helps.
These are the homeplugs i have https://www.amazon.co.uk/dp/B014HCF6X2?psc=1
Thanks again.