Windows Vista Won't Install At All?

hey guys im new to both this forum and vista itself and im having alot of trouble installing vista final rtm 6000.

i got myself an iso of vista and it seems to work fine installing in xp until i get to about 30-40% then i basically get an error saying that it cannot copy over files.. the error says the numbers 0x80070241 and it **** annoying, ive tried installing vista on both my dvd drives but get the same error and about the same point. i have searched the forum here and has read all the similar threads but all don't really help. I have been told that i should boot from dos but i can't figure out how to actually boot this vista disc from dos. Everyone here seems to make it sound so easy but whenever i modify my cmos, with dvdrom as the first and only to load it just won't read properly.

I have made 3 copies and all give the same error, i have checked with the supplier of the iso and he has proved to me that his copy works fine, so i am sure it is not the acutally iso file. I burned the file using isoburn at 4x.

Any ideas guys.. please i need help Please explain what i can do and keep it simple, since when i comes to computer jargon i ain't that fancy

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EDIT: ok guys i sorta got past the above error but know when i get to the third stage of the installation, when vista restarts into dos i get an error which says something about error code:0xC0000005. Any ideas?

my error screen is basically like this..

 

I read on the microsoft site that the iso's should only be burned at 1x or 2x and the was rc1.