I use a single administrative user, say MARC, on my laptop running Win 7 Pro.
I set up another user, say ANDROID, to allow my phone and tablet to reach one and only one shared folder on my laptop via ES File Explorer.
Everything works as expected.
Now that I have more than 1 user, I get the Welcome menu with MARC & ANDROID. I want to keep ANDROID for the share, but go straight to MARC when I sign on. ANDROID will never need to sign on at the laptop.