I download dmg files but cannot be open (not recognised). If I try try to use disk utility, it says the disk image unable to attach. Could someone pls help? Thnx

Hi, I am trying to install some programs (on mac book pro mac osx 10.6.8) that are downloaded in "dmg" file format. These are antivirus and security related programs. Unfortunately when I try to open the downloaded file, this does not open and I get message it is not recognised. I have also tried using Disk Utility but I get an error "unable to attach"l. This just started recently. I have downloaded the file several times but same problem recurs. Thanks for your help
PS: Other files directly downloaded from apple work fine.

umjustme wrote:
curious to know your reservations about Kapersky!
They screwed up the first Flashback removal tool very badly, locking several users out of their accounts permanently. It took a day or so for them to react and post a revised tool, but the damage had been done.
They are one of several formerly PC only vendors who rushed to the Mac front back in the spring after the Flashback scare. I would advise giving all of those folks time to prove they really understand OS X before installing it on any of my Macs. There are several others who have proven themselves.
Since you are running what I assume to be a fully up-to-date OS X 10.6.8 you are not vulnerable to any currently known malware capable of impacting OS X or other Mac software. That's no guarantee there won't be something new show up tomorrow, but the chances of any commercial anti-malware software catching it before Apple can react is pretty slim, IMHO.
Now if you are concerned about Windows malware, that's a different story.

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Hi aikidojoe,
Sorry to say I have not been able to solve the problem.   However, the problem only exists with Safari, as
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I download dmg files but cannot be open (not recognised). If I try try to use disk utility, it says the disk image unable to attach. Could someone pls help? Thnx

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