Downloading iso files on a Windows machine

[JOHN H DURRANT]

I have two PC's.  One running Windows XP connected to the internet and one 
running Fedora Core 1 without internet access.  I want to upgrade to Fedore 
Core 3 on the Linux box.  I downloaded the 4 iso files to my XP machine.  
Now how do I burn them to CD so that they (at least the 1st) are bootable on 
my Linux box?  Also the download site says to check the checksum to ensure 
that everything downloaded OK.  Is the md5sum command only on Linux or will 
I find it on XP?

Thanks in advance,

John Durrant
a Linux newbie