Installation Problem RC1

> Since someone spammed my previous question, i want to ask again. When i
> install windows Vista RC1, i doesn't go further than Expanding Files 47%
> My specs are:
> AMD Athlon XP 2400+
> Asrock K7S8X
> 512 MB DDR PC333
> 1x Western Digital 80 GB IDE
> 1x Maxtor 80 GB IDE
> 1x Maxtor 250 GB SATA
> SATA RAID Controller
>
> I have burned the .ISO file with Alcohol 120% to a DVD with a speed of
> 2.3x(lowest possible.) I am trying to install Vista on a IDE disk with 20
> gb
> of free space. The upgrade advisor told me that it could run on my pc. I
> am
> performing a Custom install on a harddisk wich doesn't have a previous
> version of Windows installed