windows vista won't boot past aswRvrt.sys

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right now the computer is with a repair guy who's pretty reputable, he actually thinks it may be a harware issue as he used the genuine vista home premium disk and it freezes as well.

Hmmmmm........sounds like possibly a hardware memory issue.
I'm sure the repair guy will try but you typically can go into BIOS (F2 or other key that is shown on initial boot/PC Logo screen) and do a hardware memory test.
http://www.pcworld.com/article/241032/how_to_enter_your_pcs_bios.html 
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c02097000