hi every one

I am glad to join this outstanding forum

my problem is:

I have downloaded lastxp v17.2.2 torrent twice and each took 3 days and the same problem appears.
after I burn the file to a DVD and try to install lastxp by booting from the DVD and after choosing the partition and the installation reach about 50% the installation stops and says 

( CANNOT COPY iastor75.sys )  and there are three options: CANCEL  -  SKIP  -   RETRY   

I choosed RETRY many time with no benefit     
I choosed SKIP and the installation completed but after that niether lastxp nor vista ( the original OS ) worked. I had to boot from the original recovery CD for vista.
I choosed CANCEL and sure you know it calnceled

I tried this many times and the same note come every time  I even reburn the file on other DVDs I also redownloaded lastxp torrent again took 3 days


PLEEEEEEEEEEEEEAAAAAAAASE  help me      what do I have to do ??????????