except for the one file you can rescue that file using either a Linux Live CD or a tool such as AVG Rescue CD which can not only scan for viruses that may be hidden when the OS is booted but also has a File Manager that allows you to browse for files and copy them to USB storage - http://www.avg.com/us-en/avg-rescue-cd

You could also use the tool at the following link to create a bootable Windows XP recovery concole boot disk -
http://artellos.com/arcdc-page

This link should then help you perform the system recovery to get your laptop back to factory condition. It shows how to do this from within XP (which will not help you), during startup (real nice if you can't find the disks you created), or from the recovery media -
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00608578&tmp_track_link=ot_recdoc/c00810334/en_us/c00608578/loc:3&lc=en&dlc=en&cc=us