Thank you everybody for suggestions.
I received a bit more information on what happened at the very beginning of
the first startup (my husband did it by himself). Approx. 1 minute after
starting the installing he got a "BSD". He didn't write anything down from
the error message unfortunately.
What I've done today (thanks to Joe pointing me in a couple of directions):
1. Read the documentation and found how to reach restore section.
2. Ran the restore to factory state. Unfortunately it didn't help.
3. Was able to get a "recovery cmd window" running and checked the
directories in case the winload.exe was in another place. No such luck.
4. Scanned HPs site for clues. Couldn't find anything about Vista but some
leads about XP. For example to get into BIOS setup and running the Disk Self
Test (which I'm doing now), was hold F10, press power on, let go F10 when
text show up.
If the disk is ok I am out of ideas. Will have to wait until we can get in
contact with HP support on Monday. Until then I'll document my steps so I can
tell them.
Don't you just hate giving up like this? I'd like to "blow out" the whole
thing and install XP pro. But since we bought it *with* Vista, it should run
Vista without all this hassle.
Well, thanks again everybody! Any other ideas just keep them coming.

)
Eva