Good Start.
Next step:
Using MD5 Mate (found on the same FAQ page), check the integrity of the downloaded GWX files.
If they come back as OK, check to see if you have the K-Lite Codec pack installed, if so follow these instructions:
1) Start
2) All Programs
3) K-Lite Codec Pack
4) Configuration
5) Codec Tweak Tool
6) Disable the ffdshow filter
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