Code 52 - CM_PROB_UNSIGNED_DRIVER
This Device Manager error message indicates that the device did not start on a 64-bit version of Windows because it has a driver that is not digitally signed. For more information about how to sign drivers, see Driver Signing.
Error
52
Display Message
"Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)"
Recommended Resolution
The driver does not comply with the kernel-mode code signing policy.
For end-users, the only way to avoid this error is to obtain and install a digitally signed driver for the device.
For driver developers, you can use various methods to load an unsigned driver on a 64-bit version of Windows. For more information, see Installing an Unsigned Driver during Development and Test.