About User Account Types
There are two types of user accounts available in Windows 8: a local account and a Microsoft account.
A local account is a user name and password that you set on your VAIO computer. Because one local account is expected to be used for a single computer, you cannot share the same account on multiple computers.
Setting a local account password is optional. If you forget your local account password, recover your VAIO computer.
A Microsoft account is an email address and password that you use to sign in to Microsoft services. Because a Microsoft account can be set for each user, you can share the same account on multiple computers. To download apps from Windows Store, you need to switch from a local account to a Microsoft account.
Setting a Microsoft account password is required. If you forget your Microsoft account password, contact Microsoft support services.