All local profiles are stored under a SID under HKEY_USERS - how to figure out the username
Operating System Windows uses SID, not username
If you need to find out which hive under HKEY_USERS belongs to a certain username, just look under this key:
Here you'll find the username after "Documents and Settings" inside the profile definitions.
Second option: just use "find..." context in registry editor on HKEY_USERS (it just might take a little...).
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.