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My advice would to fresh install win 7, not upgrade if possible.
Well your post got me thinking and I was able to get Windows 7 installed. Let me explain:
I had tried to install win 7 with my upgrade media by booting to the media and installing on a clean HD - but, the media will tell you that your key is invalid and you needed to boot to a previous version of windows, then install windows 7. So, I installed win xp sp3, and ended up at the point where windows 7 gave me the APCI error (which I can only assume was related to drivers). But, I thought, there has to be a way to do a clean install of windows with upgrade media, especially since the upgrade advisor stated that I should do a custom "clean" install. So, I searched and there is. I found a phenominal article here about upgrading Windows 7 through a custom/clean install. All I had to do was boot to the win 7 upgrade disk and select custom install. I'm only assuming that it worked this time because I already had a version of windows installed and activated (where I had not when I tried the first time).
Win 7 is up, running and activated.
I am glad i was of some assistance and you have it sorted now!