The built-in Administrator account really was never intended to be
used for day-to-day normal use. The standard security practice is to
rename the account, set a strong password on it, and use it only to
create another account for regular use, reserving the Administrator
account as a "back door" in case something corrupts your regular
account(s).
A wiser course of action would be to create another user account for
your daily use (as you've done), log into it once to create the user
profile folders, and copy desired the files and settings from the
Administrator account to this newly created user profile.
HOW TO Create and Configure User Accounts in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;279783
How to Copy User Data to a New User Profile
http://support.microsoft.com/default.aspx?scid=kb;en-us;811151