C/Users/ should have the folder name of your windows account, exactly as you see it in your start menu under your user picture. (Folder options -> Show hidden files and folders. Users account folders are not hidden by default.)
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As for libraries:
Windows 7 has the Personal and Public folders included in the Documents, Music, Pictures, and Videos library locations.
Public User folders are folders shared by all users. These folders are located at C:\Users\Public. The contents of public folders will be available to all users.
Personal User folders are the folders for a single user. These folders are located at C:\Users\User name. Personal folders will be open to a certain user only (if his account is password protected).