Recuva Error

Hi,

I am trying to recover my files but after some time i get below error msg and need to close recuva. System details are attached

Problem signature:
Problem Event Name: BEX64
Application Name: recuva64.exe
Application Version: 1.52.0.1086
Application Timestamp: 5515854b
Fault Module Name: ShellExt64.dll_unloaded
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4c9add55
Exception Offset: 0000000180132d6c
Exception Code: c0000005
Exception Data: 0000000000000008
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 1e37
Additional Information 2: 1e373e69fff075aed81f57003e66ce10
Additional Information 3: b4d7
Additional Information 4: b4d797bf52ac699189b90182e3746482
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Is this a known problem?
Any help here is appreciated. I have 1 TB of data to recover.. Pls help.

Attached is screen shot of system

post-74739-0-79616400-1448899371_thumb.jpg