after downloading 14w32d and running it, I look at the stuff i close it and launch 1.7.10 i choose a world and load it and minecraft crashes. i even tried re-downloading minecraft but minecraft still crashes.
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[media]

Dupe of MC-38527
The view distance has been set to an invalid value that isn't supported in 1.7.10. There are instructions in that post to resolve this.

Downgrading is not, was never and will never be officially supported.
Use a seperate instance for your Snapshots, like you are told to when activating Snapshots.