If it works, leave it alone. An upgrade offers a benefit. Window 10 does not.
This is the first time I've been angry enough to bother posting my experiences. I too have a Lenovo laptop. This G50, based on the recommendation of a friend who owns a computer repair business, is by far the worst pile I have ever used, including over nine years as a community college instructor. I've typed hundreds of documents in MS Word,, and I have two generic 'puters I built in 2000. Those old tanks still work great. This is also my first Windows 10 machine. I have used a few Windows 7 and 8 computers, and found I hated them. This being my first Windows 10, and it came preloaded with tons of junkware from Lenovo, I didn't know what I could safely remove. It is so plugged up with crap, but I don't know what to blame on the laptop and what to blame on Microsoft. I have since learned that very few people are happy with Windows 10, . . . except Bill Gates and his banker.
I have "good computer days" and "bad computer days" like women have bad hair days. It is not uncommon to have to use the power button to repeatedly turn the computer off and restart it when it locks up. If it is ever left sitting for more than ten minutes with no activity, it starts doing something that can't be recovered from without restarting it. Can't scroll pages I'm reading. Can't open Task Manager. Browser and MS Word say "Not Responding". Eventually the mouse pointer freezes too. Using MS Word when not in range of wireless internet is a major frustration. Auto-save every ten minutes locks this thing up for up to two minutes. Believe me, Window 10 is not an upgrade.
As for Microsoft's tech support, do you really think they can't afford to test on the computers on the market? The simple fact that everything works perfectly at times tells me there are software issues related to the variable combination of drivers and Windows 10 software. I never had this many problems with Windows XP. In fact, once I have a new hard drive installed, I'm going back to XP on a ten-year-old Sony laptop.
As a side note, this G50 has the worst keyboard one could ever imagine. I've never had so many mistakes to correct. Double "aa"s, double commas, gotta use a hammer to get "n"s, "o", and "c"s. About once per day the touch pad goes insane. Simply holding my finger an inch over it causes the mouse to go wild. It may resize pages and click on over a hundred ads and images. I finally figured out that if I hold the laptop over the edge of the table, and push down to flex it, the problem will clear up. It's faster to restart the browser than it is to try to turn off over a hundred new tabs. (That is not an exaggeration).
There's over 50 computers in my local library. Every one was rolled back from Windows 10 due to constant problems and complaints. As evidenced by the huge number of negative comments here, it is apparent Windows 10 is not a good value. An upgrade is supposed to offer some improvement or benefit. My first computer, from 1995, is faster than this laptop, and never locks up. The old, clunky keyboards are so easy to use compared to this one. I have never found a web site that doesn't work just fine with XP, so if there's no improvement in speed, or some other benefit, what's the value in switching to Windows 10? I have never had a computer before that made me so angry I wanted to spit nails!
And what moron thought it would be funny to make the scroll bars fade away so you don't know they're there? As far as I can tell, the purpose for shoving Windows 10 on us, especially for free, was to get each user angry enough to be a willing sucker to buy the next version. Microsoft's reputation is going to be one of those companies with customer-unfriendly business practices that put short-term profits ahead of customer satisfaction. RCA used to do the same thing, and look where they are now. We need a competitor for Microsoft. When there is a monopoly, look what we get.