I don't see any Synaptics or chipset drivers available for XP from any of the following models on HP's site:
HP Pavilion dv2800 Verve Entertainment Notebook PC series
» HP Pavilion dv2840se Verve Entertainment Notebook PC
HP Pavilion dv2800 Artist Entertainment Notebook PC series
» HP Pavilion dv2840tx Artist Entertainment Notebook PC
HP Pavilion dv2800 Entertainment Notebook PC series
» HP Pavilion dv2840ee Entertainment Notebook PC
» HP Pavilion dv2840ei Entertainment Notebook PC
» HP Pavilion dv2840er Entertainment Notebook PC
The chipset drivers are not officially available for this model thru HP website, but may be on the CD or alternatively
AT YOUR OWN RISK use the driver based for this ICH8 chip series from Compaq, HP's subsidiary
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-52944-1&lc=en&cc=us&dlc=en&product=3593060&os=228&lang=enLooking at the Vi$ta drivers indicates the laptop features the ALPS Touchpad and not the Synaptics. The driver posted below is listed as a generic software title match for all ALPS touchpads I guess.
http://h10025.www1.hp.com/ewfrf/wc/genericSoftwareDownloadIndex?lc=en&cc=us&softwareitem=ob-16536-1Another awesome job by HP for the confusion!