Windows Explorer has stopped working

Please help!

I keep on getting the following error when I close the explorer:
"Windows Explorer has stopped working" and the following detail:
Problem signature:
Problem Event Name: APPCRASH
Application Name: explorer.exe
Application Version: 6.0.6001.18000
Application Timestamp: 47918e5d
Fault Module Name: iefdm2.dll_unloaded
Fault Module Version:
Fault Module Timestamp: 474aaf90
Exception Code: c0000005
Exception Offset: 031f16d3
OS Version: 6.0.6001.
Locale ID: 7177
Additional Information 1: fd00
Additional Information 2: ea6f5fe8924aaa756324d57f87834160
Additional Information 3: fd00
Additional Information 4: ea6f5fe8924aaa756324d57f87834160

I use Windows Vista Ultimate (32bit) and I have installed SP1. What can I do to rectify this problem??

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