how to lower security in windows 10 when \\

Hi guys,

Remember with windows xp, windows 7 you can \\server and when it is the same username and password you just get through, with Windows 10 now it does not work , seems you have to put domain name in the front, is there anyway to make it work like before, it will also help with the other problem as well, such as access to Sql server...

Thank you

J