Is Logitech Media Server running clean on Windows 10?

Works fine.  Been running Logitech Media Server on Windows 10 for over three months with no problems.  If your going to jump to windows 10, I'd recommend doing a clean install.  Use the Media Creation Tool to make a Win10 Image on a USB Thumb Drive.  Make sure to use the latest build (1511), which supports entering your Windows 7 product key to qualify for the free copy of Windows 10 when installing.  Originally, they required you to do an upgrade, register your machine with MS, and then you could do a clean install.  Build 1511 fixed that headache.  Make sure to back up all your important stuff and the settings for  Logitech Media Server.

My music library consists of about 3000 Cd's ripped in FLAC.  Also, there is a light sprinkling of some Hi-Res stuff from HDTracks and others.  The Server consists of a Gigabyte BRIX BXi3H-5010 Mini PC, 8GB of RAM and a Samsung EVO 850 2TB SSD.  I actually do the ripping/tagging on my big machine and then just transfer the files over to the server.  Then I access LMS, using a browser, and tell it to re-index.  Re-indexing takes about 4 or 5 minutes.  The server is set to go to sleep after 20 minutes of inactivity.  Whenever I turn on a Squeezebox, it wakes up the server which takes about 15 seconds until music starts playing.

I also have a Sonos, a Definitive Technology W-Amp, a Denon Hoes 5 Speaker, a Google Chromecast Audio and a Google Chromescast Video (V2) in the house.  However, none of these devices will wake up the server.  So, I always have to turn on a Squeezebox and then use one of the other devices.  Also, I have it setup so my phone can access the server whenever I have a WiFi connection.  This comes in real handy if I'm over a friends/relatives house or when traveling.  BTW, the phone can wake up the server remotely.  

For years I used CompuLab Fanless PC's for the server.  When I decided to upgrade this year, I wanted something a little bit more powerful.  For a similar CompuLab PC, I was looking at more than double the cost of the BRIX.  While the BRIX does have a fan in it, it's so quite when serving up music that I have to put my head within about a foot to hear the fan.  Also, I occasionally use the BRIX whenever my big machine is being upgraded; It makes a good general purpose PC.

I'm also running version 7.7.5  

No, I do not have to login to MS to use the computer.  When you setup Win10 for the first time, it asks you to sign up for the MS Store.  It will then associate your computer with your store account.  You can skip that step.  In fact, please skip that step.

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No problem, anytime.