Trying to deploy some updates (iTune 10.5.2 for example) but always get

Fail to launch C:\Program Files\...\Remediate.exe Exit code: 20 or 40

Tried to deploy ZPM Agent Update 2 but didn't resolved the issue.

What should I do now ?

When trying to deploy Adobe Reader X 10.1.2 update, get the error
"Unspecified patch deployment script error"

Something to do with this ?