Purpose of a crack:

Windows XP PRO sp1 

The operating procedure:

Load Xp in the SAFE MODE (F8 at loading a computer)

At start up menu select run and type  regedit, then press enter.

    It is necessary to remove CONTENTS of a key of the register:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WPAEvents\OOBETimer

Run the crack.

    Then start Activation Windows XP 
    Choose activation by phone and fill in all fields 401111 and to press Next,
    After that Xp will run without problems.