|The issue is this. Microsoft discouraged OEM vendors from selling computers with WinXP. They could do that through the volume licensing program. |
So, you have new hardware that may never had any drivers written for WinXP. Some of the hardware can be configured using chipset drivers from the manufacturer of the chipset. Some of the hardware is common to older computers so WinXP drivers are available.
In the case of laptop computers the problem drivers seem to be the HD sound and WiFi.
If you are lucky, your laptop is one of the units that had an option to come with WinXP pre-installed. However, those are not usually the latest models.
Post the exact model and/or go to the HP site and see if WinXP drivers are available for all the hardware.
If you elect to go to WinXP I suggest you leave the Vista recovery partition alone. Also, create the restore disks while you still have Vista running.