Hi seveb, welcome to NST.
I've moved your post to a new thread. For future reference see
here.
Firstly HP system recovery is accessed with F11 as you boot the PC. See
here for complete instructions.
If you're unable to access the built in recovery partition because the boot process is what's broken, then you can use
our download to create a bootable disk which you can use to restore a standard Vista boot process. Follow the links on the page for instuctions on how to download torrents, and use
ImgBurn (you can get a free copy online) to burn the ISO image. Then follow the instructions to
repair the boot process.