great..i see you know the routine..."keep at it til it works"..lol
my son wanted to try it on his laptop...he's twelve...so i had him do it himself---walked him through an iso maker....after..the beta install would kick out far into the set up--had to step in on the third try and do some cleaning..and killing til it kicked in---- so far it has been running clean for him and i think i swayed him away from that current "mac" mentality...he actually loves it--haven't seen him be that enthusiastic since i got him his ipod a few years back..lol(that says a lot about the beta)
good luck with that install...maybe walk it back up from windows98..lol...just joking(maybe not)....just an old reliable when you have a crash and fix situation...best of luck