windows 7 64-bit ahci driver support

Hi ,
I am currently working on AHCI driver . My AHCI driver is working fine on windows 7 32-bit.
while booting i am bypassing signing also .
Is there any changes required in code related to memory and any ?
After installing my ahci driver in windows 7 64-bit ,system is not booting up ...

Just a guess but the issue may be because Production W7 64-bit requires signed drivers. To get around that you would need to run in test mode. Perhaps a program like dseo13b.exe can help you test.