My computer acts weird in my musics folder.-When I want to change the name of a folder the message comes up:This folder is shared with other peopleBut I know I never shared the file.In properties/sharaing tab/advansed sharing there is sharing permission for "everyone".Is it a security issue? My updated security software also can not detect anything. I scanned all files but I did not find anything.In security tab there are also two permissions for "WMPNetworkSvc" and "HomeUsers" and I dont know what they are. Are they safe? I also see an unwanted and unfamiliar permission (sometimes not always) in permission list in security tab. The name of this permission is a string starts with s-1-5-21. The odd thing is that it disappear itself after 2 or 3 seconds.