I have PC with the configuration of a P4, HT technology with a intel (R)82915G express motherboard with 80gb HDD and 512mb RAM. A DVD writer with that and an LCD screen. How well Vista run on my PC? Will it run with the same efficiency as XP is running or will it slow down my PC? If it does slow it down why is that and what upgrades must i make to make my PC "Future Proof"?