No me cierra internet explorer

Hola,
que hago con este error que no me deja cerrar las paginas de internet por favor:esto es lo que sale

Problem signature:
Problem Event Name: BEX
Application Name: iexplore.exe
Application Version: 8.0.6001.18702
Application Timestamp: 49b3ad2e
Fault Module Name: WINUTIL5.DLL
Fault Module Version: 2006.5.0.23
Fault Module Timestamp: 449b122b
Exception Offset: 0005d18c
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.0.6001.2.1.0.768.2
Locale ID: 1033
Additional Information 1: fd00
Additional Information 2: ea6f5fe8924aaa756324d57f87834160
Additional Information 3: fd00
Additional Information 4: ea6f5fe8924aaa756324d57f87834160

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Gracias de antemano