I did not say he couldn't run Windows 7 with a P4 chip, or is it a celeron? but I did say it would run better if he was running it with XP. I did state it was my opinion that a dual core processor should be used with Windows 7
I have Windows 7 running on an Asus netbook with an Arm processor, yes it'll run but not great
It'd do even better with linux .