Can't open Windows 7 Bootcamp on El Capitan


hello. installed public beta 6 of el cap other day. before, has windows 7 on bootcamp worked perfect. after install of el capitan beta, when try start windows, loads scenen there's blinkning "-" sign forever without booting os. before screen blinking sign lasted few second before actual windows booting screen cane up. idea can do? downgrade yosemite option?
 

i suspect last beta update "touched" boot blocks on boot camp partition.
don't think downgrading os x system fix windows partition boot blocks.
problem windows partition affected, not os x system.
fix booting windows installer disk, , running windows repair on boot camp partition.
there's quicker windows command line fix, repair install should fix issue.
 


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