Welcome to this Forum.
In regards to your first question, when you log in as a new user on a computer, the OS will create a new profile for you and portion of that new profile in your new desktop, that's why you user could not find the applications. (Go into C:\Document and Setting and you will be to see other profiles) , please not that if your new user account does not have the Admin rights and you forgot the Administrator's password that mean you are in big trouble.
Q-2
Further more, there are to type of computer profiles for any given user on a domain environment:
1- User profile
2- Domain profile
you may copy one user's profile to another user's account for local user but there are many complications. Best way of approaching multi user computer is roaming profile, that means every time you login as "Joe Smith" from any computer you will get the desktop setting.
sorry can't elaborate no more (this is a big subject)
http://support.microsoft.com/?kbid=314478
cheers