In reply to Beardyman:
not a direct answer to your question, but....
i run adobe premier pro on a laptop with built in intel HD graphics
where it "struggles" (ie takes abit longer) is previewing and then rendering the output compared to having a proper video card. but the program actually works fine. i haven't used vegas (but it's highly rated on the gopro forum for example)
so is your computer up to the job? easy way to find out is, is there a trial available of the software you could install?
would need more info on the spec of your laptop to know any more.