I had a lot of those problems when I installed Daz 3 on my laptop back in July. (Vista HP)
I ended up re-installing the program into C:/Daz3, instead of /owner or 'program files' dir, and have'nt had a lick of trouble since. 
Mine kept booting directly into 'quick start' and promptly dieing. It did not appear to be the graphics card, since the drivers were up to date.