Driver can't be loaded in Windows 7 64bit but can be loaded in Windows 8.

Hello, every one!
I met a problem. I had developed a driver. I signed it with a Microsoft Cross Certificate and a Certificate of VeriSign. Then I install it in Windows 8 64bits machine. It can work as expected. But when I try to install it in Windows 7 64bits machine, it
can't be verified and be refused to load while system startup. I don't know the reason. Is there any different when windows 7 verify a application and windows 8 verify? I hope some one could be kind to help me. Thank you!
Best Regards!
whiteclouds
2015-2-9

I'm sure this is a signing issue. I had contacted with certificate provision, they told me that w7 support sha1 verify algorithm, and w8 support all of sha1 and sha256. The driver I installed is signed with sha256. After I signed with sha1 instead, the driver
can be installed and load in w7 now.
But another problem happened. Today I find I can't make it be loaded in my w7 virtual machine. I am sure that the driver's signature is same as yesterday. And my w7 VM is same as the w7 yesterday too. Only 1 difference is that I installed the driver into
a w7 virtual machine, and yesterday is into a real machine. Additional, our test engineer told me that the driver can't be load in windows server 2008 64 bits too.
PS: I see the error in Event Browser following the path: Control Panel->Manager Tools->Event Browser, then open node: System tool->Event Browser->Application and Service->Microsoft->Windows->CodeIntegrity->Operational. There are many
error messages listed in right side. Double click anyone, the message popped up say: "Windows is unable to verify the image integrity of the file \Device\HarddiskVolume2\Windows\System32\drivers\MYDRIVER.sys because file hash could not be found on the
system. ..."
Please tell me how to fix it or a http link is preferred too. Thank you!
Best regards!
whiteclouds

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Driver can't be loaded in Windows 7 64bit but can be loaded in Windows 8.

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