AFIC, removing Vista and installing XP is an upgrade, especially for a laptop, because XP is less of a resource hog, leaving more for running programs and using less for their candy apple visuals and overbearing, nanny state protection system.
As
mechBgon notes, you'll need your own copy of XP.
I recently upgraded removed Vista from a new HP Pavilion a1520n and got it completely working with XP Home. Some of what I found may be unique to HP's specific setup, but what I learned may give you some clues about what to check to install XP on another system.
Before you start, make sure you have your restore DVD's/CD's. Some manufacturers no longer provide them and instead, they require you to burn a set from the installed software. You'll need them if you have to send your machine for warranty service.
One important thing I learned is that
Vista does some strange things to the partition table.
1. How many hard drives do you see? On the HP, it showed two, one of which was used for restore purposes. If that's on yours, it has to go. See below for ways to do that.
2. In the CMOS, look to see if the drive is set for ATA or RAID. If it's set for RAID, change it to ATA.
I used Partition Magic, booting from a floppy, to remove them. As it was booting, the program gave me a message that something was wrong with the first partition and asked if I wanted it to fix the problem. I clicked "Yes," and that was the end of that problem. I could then remove both partitions and set up a single, active standard NTFS partition.
If you don't have Partition Magic, you can try
delpart.exe. It's a genuine Microsoft utility from NT 4 that will allow you to nuke an NTFS partition from a bootable DOS floppy or USB drive. I've used it, before, and it works, but I don't know if it will with Vista's partition setup.
In any case, the objective is to blow off all partitions created by Vista so XP sees a completely new, unpartitioned, unformatted drive that will allow you to create a new, standard NTFS partition.
Good luck.
