Unhappy [Q] I Got Boot Verified Failed and Recovery Verified Failed

Hi Guys ,
I was having acer iconia a500 updated with offical ICS and rooted it ... when i tried to install CWM through acer recovery installer ... it rebooted and
shows me both error boot verified failed and recovery verified failed....
i tried many different methods in forums but still i cant do any thing !!!!!


Please Help Me Out