I can tell you exactly how it is dangerous. I have vista ultimate oem upgrade on a HP laptop that had vista home premium on it. Every time I install and apply a new boot skin my system will not come up on reboot. In fact it hangs at a blank screen. I have had to use two extra of my five lifetime limit of online vista activations to reinstall everything back onto my system and trust me it's alot of stuff that works perfectly otherwise and is well tweaked and hummi
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