Windows XP is a fully rebuilt version of Windows that makes use of the success of Windows 2000 and adds many unseen enhancements in stability, performance, and security. Windows XP comes in two versions, Windows XP Home Edition and Windows XP Professional. Your tablet runs Windows XP Tablet PC Edition, which is actually a version of Windows XP Professional with additional functionalities added.
Some of the differences you will see in Windows XP are:
New login screen and user accounts
Unlike Windows 95, Windows 98, and Windows Me, you must have a login account with a username and a password to use Windows XP. If security is not an issue for you, the tablet can log in to your account ...