Windows Explorer keep crashing vista

Bonjour
Windows explorer on Vista keep crashing. It does not open the desktop. As soon as my Laptop starts, immediately it says that Windows Explorer finds a problem and needs to close, and then other windws that Windows explorer is restarting. and then again the first windws. So this is a continuouse cycle. I used al+ctrl+del and end process Explorer.exe and then can only able to open My Computer through Run.

Report is

Problem Event Name: APPCRASH
Application Name: Explorer.EXE
Application Version: 6.0.6002.18005
Application Timestamp: 49e01da5
Fault Module Name: QuickTime.qts_unloaded
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4c87d299
Exception Code: c0000005
Exception Offset: 5dbcbb69
OS Version: 6.0.6002.2.2.0.768.2
Locale ID: 1036
Additional Information 1: a34a
Additional Information 2: c9c5f4fd744690d388ab9d5b3eb051a7
Additional Information 3: cb2e
Additional Information 4: 650bb5690556a17e911375b94d3e16f0

Anyone can help that what should I do????????????????????

This article and the petite software of detecting shell extension solved the problem

I too had a similar kind of problem in my vista system and I noticed something that if I would uninstall RealPlayer to see if it would have any effect and Windows Explorer stopped crashing. I reinstalled it (including "Download this Video" plugins) and immediately Windows Explorer started crashing. I uninstalled it and reinstalled it without the plugins and Windows Explorer started crashing again.