Just consider this for a moment. You have got a new computer presumably with Windows 7, which for some reason you don't want.
So you have gone out and got a copy of XP and wonder why you cannot get things to work.
Your new computer will have hardware that came yonks after XP was dead in the water and very likely there are no XP drivers for your setup, and never will be.
Got nothing to do with Microsft or ISP. You are trying to use up to date hardware with an out of date version of windows.
Go back to Windows 7 if you still can and update your apps.