Appcrash

Why do I get the Problem Event        

Problem signature:

Problem Event Name: APPCRASH

Application Name: Explorer.EXE

Application Version: 6.1.7601.17567

Application Timestamp: 4d6727a7

Fault Module Name: StackHash_d438

Fault Module Version: 6.1.7601.17725

Fault Module Timestamp: 4ec49b60

Exception Code: c0000374

Exception Offset: 000c380b

OS Version: 6.1.7601.2.1.0.256.48

Locale ID: 1033

Additional Information 1: d438

Additional Information 2: d43826fc7d309602956d151b4cd66be5

Additional Information 3: 4ace

Additional Information 4: 4ace50051d1dfe8ab9420fb22809185b

This happens when I try to print to one of our network printers.

Any helo is appreciated.

Thanks