Explorer.exe error

Friends, please help. My colleague always got explorer.exe error on his system. Could anyone can help to check why this happened? I enclosed his event log for you reference. OS is Windows XP, sp2.
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Faulting application acrord32.exe, version 8.0.0.456, faulting module unknown, version 0.0.0.0, fault address 0x07a6a600.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Faulting application explorer.exe, version 6.0.2900.3156, faulting module unknown, version 0.0.0.0, fault address 0x07a6a600.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Faulting application iexplore.exe, version 6.0.2900.2180, faulting module flashgetbho.dll, version 2.4.0.1033, fault address 0x000179ab.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Faulting application explorer.exe, version 6.0.2900.3156, faulting module unknown, version 0.0.0.0, fault address 0x074ea600.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.