Lost my booting Windows 7 after upgrading to 10.7.2

i bought 2011 macbook had lion 10.7. running parallel os windows 7. working great until upgraded 10.7.2 icloud. couldn't windows boot , boot camp askes disk of windows 7 proceed trying repair. question is, can revert previous os? @ don't know if able windows 7 boot back.

 

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