Windows 7 PC not connecting to 1.1.1.1 DNS

I tried following the instructions but my computer just doesn’t connect to 1.1.1.1. nslookup gives UnKown as the output and the only thing I am able to access is https://1.1.1.1 and some variant of that like https://1.1.1.1/someexamplepage. I cannot acess google or any other website once I change the DNS on the PC to 1.1.1.1 and 1.0.0.1. I can connect fine though the app for android on my phone but I cannot find any resource or troubleshoot the problem on windows 7. Seems that nobody has this issue except me. I am a novice so I don’t really know what I should do or post here so someone can help me. Please tell me what diagnostics I should run and post here. Really appreciate any help!