Staying on Win7 to avoid the bullshit of Win10 is fucking retarded. 
Win7 is doing almost as much logging and telemetry as 10 is, it's like "Nahh... this is JUUUUUST the right amount of my privacy being stolen and sold for private profit, win10 is too much". 

Use linux, Your special cut-down epic leet hacker iso of win7 is STILL compromised. 

A little bit of knowledge is a dangerous fucking thing, you're the same as people saying "Oh no I'd never buy an oculus headset, FB is tracking everything you do!" t. sent from my iphone with default blobs and tracking settings lettings the depth camera map my entire fucking house and record every goddamn fucking step I make as well as report home every time I fart. 

Imagine you're on fire and someone offers you a bucket of petrol to put it out. Of course you're not going to use that right? But instead of going for the water you're saying "Nah this is alright". 

Your opinion on security isn't worth a shit in a swamp if you have a smartphone that runs iOS or has the google core components installed or if you run any version of windows after XP, that was the last one you could truly disable all telemetry for.