In Windows 8 you may connect your Windows Live ID to your Windows 8 account.

This is an essential feature of the operating system and allows the user to roam on devices.
I reccomend doing this to get the best Windows 8 experience.

This is how you do it

Put the cursor in the bottom right corner to find the charms and click settings
Click more pc settings
Click on Users
click on switch to Microsoft Account (aka Windows Live ID)
You may have to verify ownership by inputting your cell phone number
Enter your Windows Live ID email and Password (e.g. your MSN account or Hotmail account)
My Live ID is in sync on this computer