Minecraft Won't Start!!!

FATAL ERROR: net.minecraft.bootstrap.FatalBootstrapError: Unable to un-lzma: LZMA.LzmaException: LZMA : Data Error
at net.minecraft.bootstrap.Bootstrap.unpack(Bootstrap.java:134)
at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:111)
at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:367)

Please fix the error and restart.

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It affects the version 1.7.10 however I can't even start playing, I am stuck on the launcher, I have never seen this before though (the writing above).

Please Help Me.....

Regards brettt60