Antivirus crashed during scan

always crashing at scanning file in my USB “FILE0147.CHK” (attached along with my computer configuration):

Problem signature:
Problem Event Name: APPCRASH
Application Name: cavscan.exe
Application Version: 4.0.4167.742
Application Timestamp: 4b8e9963
Fault Module Name: script.cav
Fault Module Version: 4.0.4167.742
Fault Module Timestamp: 4b8e99a8
Exception Code: c0000005
Exception Offset: 0000000000002003
OS Version: 6.1.7600.
Locale ID: 9242
Additional Information 1: 4dd3
Additional Information 2: 4dd3f02e78bd9cd965de15fe752bd24b
Additional Information 3: 8420
Additional Information 4: 84202097e38c739116f5c26e6eb096ab

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This happened with me also while scanning .chk files. Till the time I pressed don’t send error report, the CIS continued with its scanning, though it could not ‘finish off’ giving ‘results’.

Also, when don’t sent error report was pressed, the CIS scanning window closed, but CIS did not go from tray icon and CIS antivirus also, it seemed to be active, as I could still initialize scanning the USB without rebooting, though every time after scanning for sometime, CIS antivirus would crash. Checked again after rebooting to check it was an ‘one off’ situation, but the crash re-surfaced again and hence seems to be a bug.