Need help please. (DNS Server)

I'm using a Windows 7 Laptop, and yesterday my ping was high so I flushed/renewed/released my DNS in CMD then my internet stopped working and it had an error saying "DNS Server not responding", everyone's else internet was working but not mine. I found a video on how to fix it and it told me to do this [spoiler][/spoiler] (From Obtain Address automatically, to Use to following DNS server) then it ended up working. The thing is I can't access my router page anymore, nor can I play my Xbox online for some reason (I connect my Xbox with an Ethernet cable to my Laptop). When I try to put it back as "Obtain DNS automatically" it works for a minute then it stops so I have to switch it back.

Does anyone have a solution? I can go on TV for someone that's trusted.

pparks1 said:

You can set your computers DNS server to whatever you want to use. You can use 4.2.2.1 or 8.8.8.8. This should have no impact whatsoever on any other device on your home network, your Xbox, etc.

I can't access my modem admin page on "Use the following DNS Address", but I can on Obtain automatically and Xbox Live still won't connect. It was working fine before I did all the flushing and stuff.

Do you got Teamviewer so you can help me or something?

I am experiencing the same issue too, I've tried 208.67.222.222 too but I want a more faster internet speed.