If its a local account on an XP machine or 2000 you can enter control panel and local users icon to reset accounts. Or enter RUN from Start menu and type lusrmgr.msc to open the applet directly. If the account resides on an active directory server environment then you will need to open the ADUC. You can do this by either drilling down to it from the administration tools menu off the start menu or via control panel or by going to RUN from START menu and entering DSA.msc.
right click mycomputer -manage-local users and groups-users-select the user name-right click and click rename-type the name which we wan to use-click ok
1) Run anti-virus apps and clean registry 2) If that did not resolve issue, then reimage HDD 3)
If that still did not resolve issue, then replace either HDD or system board needs to be replaced
