blender 2.56 crashes when i try to open a new window

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hi. i use windows vista. if i try to duplicate a window or open a new window on top of the default window blender will crash. this is the message that i get from windows:

Problem signature:
Problem Event Name: APPCRASH
Application Name: blender.exe
Application Version: 0.0.0.0
Application Timestamp: 4d1c49dd
Fault Module Name: ig4dev32.dll
Fault Module Version: 7.15.10.1637
Fault Module Timestamp: 4970b5cd
Exception Code: c0000005
Exception Offset: 0009e23d
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

any ideas as to why?