Like jh mentioned, I would give win32diskimager a try, there were many reported of winimage didn't work well.
Search for the win32diskimager, older version is better for some reason, 0.15 or something. If you can't find, let me know, I'll host the file.
Again, redownload all files, make sure no hiccup in the middle of downloading process.
What you did was correct, just to let you know.
CM7.2-RC1 MiRaGe KANG on eMMC - Dalingrin's OC kernel 188.8.131.52 @ 1200MHz NOOKcolor
Official CM10.1 Nightly on Kindle Fire 1st-Gen
SHOstock2 v5.4 w/ Apex on SGSII-i777
Pinky Unicorn 4.14.2013 KANG JB-4.2.2 w/ Nova on SGS2 i777
Hellybean 4.7.2013 JB-4.2.2 w/ AJK 1.49 on SGS2 i777