Due to some weaknesses in the MD5 hash function, Fedora Core 4 comes with SHA-1 checksums key. To test your ISOs on windows you need sha1sum.exe program You can download it from 

ftp://ftp.gnupg.org/gcrypt/binary/sha1sum.exe (20k)

http://www.cryptosys.net/pki/pkiintegrity.html

ftp://ftp.gnupg.org/gcrypt/binary/sha1sum.exe.sig 

ftp://ftp.gnupg.org/gcrypt/binary/sha1sum.c (9k)

ftp://ftp.gnupg.org/gcrypt/binary/sha1sum.c.sig 

Download the sha1sum.exe and put it in your windows system 32 directory (e.g. C:\WINNT\system32) directory. You can calculate the checksums key by type sha1sum *.iso on the command prompt.

C:\LinuxISO\stentz-binary-i386>sha1sum *.iso
3fb2924c8fb8098dbc8260f69824e9c437d28c68 FC4-i386-disc1.iso
31fdc2d7a1f1709aa02c9ea5854015645bd69504 FC4-i386-disc2.iso
032455cdf457179916be3a739ca16add75b768b7 FC4-i386-disc3.iso
f560f26a32820143e8286afb188f7c36d905a735 FC4-i386-disc4.iso
736e1555e88740d6131c5c84fbe69ed1073ba82d FC4-i386-rescuecd.iso

Verify that the generated checksums key is same as "SHA1SUM" downloaded with Fedora Core 4 ISOs.