How do I rename the Admin home directory?

I am running Vista Ultimate and have an Admin account called "Admin" and 2
user accounts setup. The Admin account has a home directory currently not
called Admin. Is there a simple way to rename the existing home directory
without causing any issues for the account?

I tried to simply rename the folder but it doesn't make the change nor does
it give an error message...which is odd.

In the CONTROL PANEL-> USER ACCOUNTS it looks like I can change the account
name, but that is not what I want to do. I just want to rename the home
directory so that it is named "Admin".

Can this be done easily without causing major problems?