I need guidance on upgrading a PCI driver for my company.

I am trying to update the code we have for our current PCI card. We manufactured this card in house. When I do a fresh install of windows 7 32 bit it will work as intended. After applying all the windows updates nothing seems wrong but you try and shut down
the machine it blue screens and reboot.  The PCI card will work with our application fine. Its just something in a windows update that is causing it to blue screen when you try to shut the machine down. Currently this driver isn't digital signed  either
lame I now do you think this would be one of the reason?
This driver is in need of a face lift for sure. I am not sure how to go about doing this. I have the source. I need some guidance. I have started reading the resource provided here https://msdn.microsoft.com/en-us/library/windows/hardware/ff554678  
I have tried windows 8.1 and it just tells me fail and won't even install... So yeah its time to upgrade this driver. The unfortunate thing is the driver has passed through many developers. Not real guidance on the code or how it was compiled.  The
driver also needs to work on 64bit as well. 
I appreciate you taking the time to read this. 

To get some idea on the blue screen enable the crash dumps for Kernel Memory Dump (under Advanced System Settings under System in the Control Panel).  Once you have the dump open it with Windbg and issue a !analyze -v command, if the crash is not obvious
to you post the results to this discussion.
On the driver you may want to consider migrating the driver to KMDF.  While this may look like more work it will actually make for a more robust and simpler driver.  Take a look at your drivers, IRP_MJ_READ, IRP_MJ_WRITE, and IRP_MJ_DEVICE_CONTROL
this is the code from the current driver that would need to be migrated, the rest of the driver for the most part is pretty standard for any card.
Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

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