I think your notebook can create multiple copies of System Repair Disc and 1 set of Recovery Discs which you may have overlooked. From your Start button, type repair disc
and choose "Create a system repair disc". Have your 1 piece CD-R disc ready by this time and then proceed as instructed. If your computer came with a recovery partition, you can also create a set of recovery discs. Recover Windows Vista OS using HP Recovery
could only be a last resort if you've backup all important documents. This is only applicable if the system is beyond repair
. If you are successful in creating the system repair disc, boot from there and follow the links including the MS support fixit if needed.