This is a simple but effective registry hack that has been tried and tested several times by me and it works!!
If you don’t believe me then try this for yourself!

1 – Start menu/run/ type “regedit” and press enter,
this will take you to the registry editor

2 – Now follow this directory:
HKEY_LOCAL_MACHINE/Software/Microsoft/WindowsNT/CurrentVersion/WPAEvents

3 – When you get to WPAEvents in the righthand column there should be “OOBETimer”
right click it and go to “modify”
Change the numbers in there to :

FF D5 71 D6 8B 6A 8D 6F d5 33 93 FD (this works with Windows XP Home and Pro, both 32 and 64bit versions)

4 – When you’ve entered them, right click on the file “WPAEvents” and go into “permissions”

5 – In there highlight “SYSTEM” and underneath it check the two boxes under “deny” and click “OK”

6 — Run then enter oobe/msoobe.exe /a