Trying to burn a Windows 7 ISO file onto a DVD

[goodidea]

I am trying to burn a Windows 7 ISO file I downloaded from Side Micro onto a DVD-RW using Imgburn, and get the message "There doesn't appear to be enough space on the disk to burn the image."

The number of sectors in the file is:     1,251,484      2,444   MB
The number of sectors on the disk is:     859,847          702  MB

Can I break this up to put it on several disks? And if so, how?

[LIGHTNING UK!]

That sounds like a cdrw rather than a dvdrw. Double check your discs.