I always use Deamon Tools, a free Software program.
Open the ISO File with Deamon Tools. It looks like a normal CD that you have opened.
Then use Nero to burn the Files to a CD. It is that simple.
One thing tho, you may need to look around for the actual Boot File. Most downloads of MS Programs do not come with this. You need to download the Boot ISO, and install it to the files you are burning, then burn the lot...
Hope that makes sense, I am getting tired...lol.