Duplicate User Accounts

Hello:

After upgrading to Vista Business from XP Pro, I find that under my User
listings I have multiple Users:

Default (normal?)
User 1
User 2
User 2.HOMECOMPUTER
User 2~HOMECOMPUTER

As best I can tell, when I log onto Windows, it is defaulting to
User2.HOMECOMPUTER (thus the ~?) but all of my settings seem to be under the
User 2 folder. Thus, each time I log on, I have to reactivate my programs
and reload files (e.g., Quickn file). Is there an easy fix for this or is
something wrong?

Thx.
John