What I did first was to create a new WinXP x64 SP2 DVD (with IE7 + WMP11 + WMP11 updates) and at the same time i turned it into an unattended boot disk as well. That one worked a treat. After that, I rebooted my PC and used nLite to copy my new updated DVD to my HDD, i then added WinXP x64 hotfixes plus some other addons and then modded WinXP. Burned it to DVD and now all is ok.