First, go to Start > Control Panel > System and Security > Windows Firewall > Allow a program through Windows Firewall and check the box next to KODAK AiO Home Centre. If you can't find the program in the Allowed programs and features window, press the Allow another program button, navigate to the installation directory, select the executable file and press Add. Also, from the Advanced Settings select Inbound Rules > New Rule. Check the Port box, click Next, select All local Ports and follow the self-explained steps. Also, make sure that your security program doesn't block the connection.
If you can't log in because you no longer remember the username or password, navigate to the official web page, click Forgot your username or password? link and follow the provided instructions. If you still have issues, I suggest you contact the Support Team.
