"Why couldn't you install XP on the Vista book?"
Would have except there are no XP drivers for the sound. So he would have a brand new machine with no sound.
"If you have an 8gig using vista and go to xp... only 4 will be recognized."
Yes. XP 32-bit and Vista 32-bit will both show a maximum of around 3.5Gb no matter how much memory you put in.
If you need (well want really, no normal human needs 8Gb at this juncture IMO) anything above that you have to go Vista 64bit and that my friends is a nightmare in waiting.
The best advice is to get XP now, wait until mid 2009 and then upgrade to
Windows 7. Skipping Vista altogether is the way to go.
Windows 7 will be what Vista should have been when it was released. I liken it to
Windows Me and
Windows XP.
Windows Me is (well was until Vista was released) the worst OS every released and XP is arguably the best. The way it is looking Vista and
Windows 7 will follow that same path.
As an update to my prior post, the fella I was talking about returned the Vista 64 machine and received his new machine with XP. It is many times faster than the Vista machine (which had 2x the memory) and all his applications are now running solid as a rock.