I have seen this issue with 10x and 11x, however currently I'm working on 11. You can look at my previous posts to see additional details because I have posted about this issue in the past with no luck on obtaining a good answer. Luckily I now have more details and pinpointed the issue down to only patches. When installing a patch, the msp and Mcafee On Access scanner conflict because On Access scanner is scanning the file the same time the msp is attempting to modify the file, this results in the msp reporting Error 1321 (security permissions error). This has only been seen on Windows XP. I have never seen this occur when installing the main Adobe Reader installation, only on patches (msp's) and in this specific case it's the 11.0.03 patch. The obvious solution here is disabling Mcafee On Access scanner (which I have confirmed resolves the issue) however that is not an option in my environment. We refuse to leave the machines vulnerable during an installation. A case was opened with Mcafee and their engineers could find nothing that Mcafee was doing out of the ordinary and could find nothing proving Mcafee was doing anything incorrect on their side, they have requested Adobe look into this issue to find root cause. The bad news is that Adobe Reader is a free product therefore there is no premier support that I am aware of, which leaves me with this forum. This does not happen for other installations as often as it does for the Adobe Reader patches. It does not happen every time the patch is installed but it happens very often and the file reported with issues is different every time. My question is, does Adobe have any thoughts on why this could be happening so often for their patches (msp's)? Is there something being done out of the ordinary? Please feel free to let me know if any additional details are needed.
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