Unknown Account In List Of Users

Only just recently downloaded win10 and everything is fine, however in going to edit the tag information for an audio track I noticed two additional "Groups or user names" in my list which weren't there when I was running win7.

The first one is " Account Unknwon (A-#-#-##-10#-10#-10#-4#)" where A represents a letter and # a number (and therefore 10# is 10 numbers, and so on) with the actual string omitted for security (just in case). This account has permissions limited to "Read & Execute" and "Read" (<- duh microsoft).

The second is WMPNetworkSvc, which after the slightest bit of googling told me is some kinda service for sharing media. The questions here are;

Did this service activate automatically with win10 upgrade (didnt exist for me before then), is it important?,

Can i delete it without effecting my "windows experience" considering I dont use any of the new features outside of the local machine (i.e. apps, etc) and if yes to 3, how?

These users only pop up in specific locations, for example, if i right click the desktop folder in "Quick Access" it only has the three standard users. In the same manner but for the music folder both of these new users show up. In the documents folder the anonymous user has permissions by not WMPNetworkSvc.