If the md5sum is correct and you've burned it OK, then you should just be able to put the disc in the drive and reboot the system to start it.
If you're not sure about the md5sum, then under windows, download md5summer
(get whichever version you think is best, I used the selfextracting one), install it, start it, and tell it to "create sums" drop and drag or navigate it to where you downloaded the file/select it, and tell it to create sum.
Once it's finished, you have an md5sum to compare with the one you got from the mandrake move download site. If they're the same, then you can burn the disc, if not you'll need to redownload it (the mandrake move that is!).
As for burning iso images, you'll have to google for something like "burn+iso+image+nero 5" or whatever burning app you have for windows.
But this shouldn't be a problem, all the download iso's I've tried have been burned with nero 5 under winXP, if I've burned them wrong, then I've got nice new shiny coasters, if they've burned ok, then yes they've booted fine.
Don't forget, with mandrake move, you need a usb memory key drive type device if you want to keep settings, personal files etc.
If you find that your system just doesn't want to boot from a cd you'll probably have to go into the BIOS settings to change the boot order i.e. instead of say, C drive, floppy drive, CDROM to CDROM, floppy, C drive. You can access the BIOS settings when booting windows, it tells you to hit the F1 key (or maybe Delete key, or whatever it tell's you), and you can access the pages from there - if your not sure, then just quit it, and DONT save any changes.
Post here, and I'm sure someone will be able to guide you.