|First of all you better make sure that ALL the needed drivers are available for WinXP. That very well could be a problem with a new laptop. The wireless LAN and the HD sound seem to be the most problematic. |
That said, if you can collect all the needed drivers I suggest you burn them to a CDR for use after your do get the basic WinXP install up and working. You may not have any internet at that point.
The method needed to install WinXP is to remove the Vista installation. DO NOT remove the restore partition because at some point you may want to restore Vista.
The other issue is that WinXP has no native support for SATA controllers. So, you may need to slipstream the necessary drivers into your WinXP CD.
If you are attempting to use a CD from an OEM computer, like a Dell, etc, that will not work. Those CDs are keyed to the motherboard of the system they came with.
If you have a FULL version of WinXP it MUST have at least SP1 integrated into the CD in order to install to a hard drive larger than 127GB. That restriction is in addition to the issue of the SATA controller drivers mentioned above.
There may be more ground to cover but you should first respond to ALL the points raised here.