Agent installer shows error message, 'RunDLL: There was a problem starting...'

Issue

Sometime you might see an error message,

RundDLL
There was a problem starting <file>
<file> is not a valid Win32 application.

Where <file> is the path and file name. For example, C:\windows\Installer\MSI8421.tmp. In most cases, this happens with the Silent Agent with a MSI installer:

mceclip1.png

Causes

You might see this message because Windows firewall is blocking a file.

Solutions 

Disable Windows firewall before installing the agent.

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