Here's the restore to factory default procedure:
BTW, this results in a clean install of Vista, all drivers, and any software the machine came with.
This is from the "Troubleshooting and Maintenance Guide" HP #c01152960.pdf
System recovery at system startup
If Windows Vista is not responding, but the computer is working, use these steps to perform a system recovery
NOTE: System recovery deletes all data and programs that you created or installed after purchase. Therefore, ensure you back up any data that you want to keep onto a removable disc.
1 Turn off the computer. If necessary, press and hold the On button until the computer turns off.
2 Disconnect all peripheral devices from the computer, except the monitor, keyboard, and mouse.
3 Press the On button to turn on the computer.
4 Immediately, when you see the initial company logo screen appear, press the F11 key on your keyboard repeatedly until the Recovery Manager window appears.
5 Click Advanced options.
6 In the Advanced options window, click System recovery, and then Next.
7 Click No to back up files (if you have already done so), and then click Next. System recovery begins. After system recovery is complete, the computer restarts.
8 Complete the registration process, and wait until you see the desktop.
9 Turn off the computer, reconnect all peripheral devices, and turn the computer back on.
10 Perform the procedure "Performing the post-recovery procedure" on page 27.
>> I'll post the procedure for step 10 if requested.
Edited by davnel, 08 December 2013 - 06:23 PM.