not abale install fedoracore from local harddisk image files

[sekhar_vrc]

hello sir

             I have downloaded fedoracore-ii copied the cd's with the .iso files
and successfully installed.

             But when i want to install the same fedora core through local harddisk imagefiles
it is failing.
           
             I have fedora core cd's are converted into .iso files
             i.e  
                     disk1.iso
                     disk2.iso
                     disk3.iso
                     disk4.iso
               
              using dd command

             dd if=/dev/cdrom of=home1/rh/disk1.iso

             i have transfered this to vfat disk
            and stored in directory c:/fedora.

            when installing default packages it is getting installed
           but failing when choosing "every thing" option.

            But when i am trying to install from cd's  "every thing " optiion is also
            working.
         
             i am suspecting the dd command for creating    .iso files.
             Is there any better way of doing.?

             Even i tried to install using nfs but then also i am encountering error
             with some packages, where as same are getting installed when
             trying from cd's.

 please guide me

sekhar