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Find out which patch is throwing this error, exit code 1605 means patch is trying uninstall older version which does not exist.
Patch is getting existereince of older version based on either registry setting or file system, howev when it tried to uninstall, older version does not exists.
Are you getting this error on all machines or single machine?
This is happening for 3-4 windows servers ...is there any way to resolve this problem? even i have reboot the targets but still it throws the same error?
You have to find out which patch is causing this error? The fixe is based on type of patch such as .net, Adobe etc
below links might help you,