For Windows 7 64-bit system, network card (digital signature) error code 52:
Windows6.1-KB3033929-x64.msu

For Windows 7 32-bit system, network card (digital signature) error code 52:
Windows6.1-KB3033929-x86.msu

For Windows 7 64-bit system, network card error code 37:
windows6.1-kb2685811-x64_191e09df632b70fd4f4b27d4cb9227f7c5a1c98c

For Windows 7 32-bit system, network card error code 37:
windows6.1-kb2685811-x86_4db620a8b8e85bab4822626530d01fd923c28786