After playing 1.8-pre1 on a map, changing to a earlier version and trying to load any map causes a crash. (Tested 1.7.2, 1.7.4 and 1.7.10)
This has happened to me twice now and I had to delete all appdata to fix the problem.
Crash reports attached.
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Dupe of MC-38527
The render distance has been set to an invalid value that isn't supported in any of these versions. There are instructions in that post to resolve this.

Duplicate of MC-38527. You have your view distance set to values invalid for versions lower than 1.8. Please keep in mind that downgrading isn't supported.