Agent update error... (One or more pre-requisite updates)

Hello

We use ZCM 11.2.2 on Windows 2008 R2.

Some devices failed to update. The error is : "One or more pre-requisite updates failed to install to this device. Ensure all pre-requisite updates have been applied successfully and try again. "
All devices are Windows 7 SP1 x64 (either french or german).

What can I do with this situation. Asking a technicien to go on each failed devices and try to reinstall the agent is not really cool...
I wonder what are the missing pre-requisite as almost all worksations have the same base configuration? Where can I found this information?

Thanks in advance :-)