Windows 7 RDP with blank password

I have a windows 7 HTPC setup atr home that is not part of my domain (in orderr if it reboots it reboots all by its self and dont ask for a password or ALT+CTRL+DELETE

but I wanted to work on it with RDP. But when I connected I gotr the following error:
"Logon failure: user account restriction. Possible reasons are blank passwords not allowed, logon hour restrictions, or a policy restriction has been enforced.". Even

Solution:
run secpol.msc /s and then under Security Settings -> Local Policies -> Security Options set the Accounts: Limit local account use of blank passwords to console logon only to disabled