Hello srblood,
first you must be sure you are writing to a DVDR/RW and not a CD.
There is not enough room on the CD.
Second ,as you have been advised by kiwinsn you must use a slow burn, and not interrupt the process until you are sure it is complete.
Third, make sure you are using the right software to burn the downloaded .iso.
I have never burned an .iso using Windows so I don't know how relevant the last point is.My first Linux Installation was from a coverDVD on Linux Format. This was Linux Mint from which I have obviously moved on. I mention this because it may provide another option.
If you have a cover-disc with another live-bootable Linux -distro -Mint-Pingu,etc you can pop it in the drive and run that as a live-install. After it has loaded go to Applications>Sound & Video>Brasero ( or similar ) and after browsing for and selecting the U.E.iso-file, burn a new DVD from there.This process will work perfectly from the " live" option, though it may be a little slower.
However, as also stated by kiwinsn ,none of this matters if the mD5sum isn't right.If it isn't then the file is corrupt or incomplete.
Then there are two last options.
a/download a new iso-file
b/ go to linuxcd.org and order an already burned installation disc. There is a minimal payment including P&P which should be under £ 5.00 in total and the disc should be with you in two or three days.
All that I am or seem is but a dream within a dream.