Boot into Windows 8.1 and 7 problems

I have Windows 7 (64 bit) on a SSD. I just installed Windows 8.1 (64 bit) on a HD. I installed Easy BCD. Windows 7 works fine. When I choose Windows 8.1 I get a "digital signature" error. I tried repairing the disk as it said but nothing works.
What do I do???


Knows where his towel is.
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