Operating System
OS X Yosemite
Version 10.10.5
iMac 2,7GHZ Intel Core i5
External (and attached) backup
Sophos Anti-Virus
Home Edition version 9.4.2: threat detection engine 3.64.1
The antivirus software 'hangs' on specific dmg files notably Apache_OpenOffice_4.0.0_MacOS_x86_install_en-US.dmg, pdf-converter-mac_full756.dmg, Firefox 29.0.1 .dmg along with a dmg file for some no-longer used and trashed accounting software MoneyWorks.dmg.
Help please in this ... the issue is becoming frustrating
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