How a computer is uniquely identified online other than MAC address

[skyshark]

I use Microsoft OS. For any private searches, websites, I use VPN.

I am curious to know how a computer could be uniquely identified by some one (ISP, FBI, NSA etc) other than the computers MAC address. I tried changing SID but it was crashing my system. I know tools like OSFuscate cant fool tools like Satori which is used for OS fingerprinting.

*. Would it be possible to access the unique processor id or Hard disk id online?

2. What is the best way to hide OS information online. Any other tools other than OSFuscate?

*. How to Spoof system info online (Not spoofing MAC Address)?

4. Is there any way to change the uniqueness of my system each time before I go online each time?

5. I set my DNS server in my network adapter settings. But it reverts back to nill each time I restarts the machine. Any way to set the DNS address permanently for a network adapter - dnscrypt ?

Appreciate any help...