>>>...So, is it the password that was used during setup?
>>
>>No. Try create some users with your laptop and PC. Try connect that name from laptop to your PC... That occurs sometimes mine too and I couldn't understand why...
>
>How do I connect "that name from laptop...?" I'm trying to just map a drive using "\\MyPC\c$" and then I put in the administrator password I just created using MMC. How do I get a specific user name in the mapping?

there's another usage at command prompt:

net use \\mypc\myfolder /user: password /persistent:yes