Can install MicrosoftSecuirtyEssentials on one HP laptop running 64-bit Win 7 but cannot do on another.

I have a 2011 HP Pavilion laptop running 64-bit Windows 7 Home Edition. 

I have a 2014 HP Zbook17 laptop running 64-bit Windows 7 Professional. 

I installed MSE on the first PC without incident and it runs fine there.  

Installation of MSE on the 2nd PC bombs out immediately, generating the error message that "Installation Failed".

At the time of each installation (or attempt thereof) I had MalwareBytes Anti-Malware installed and running on the target PC.   

So, why was one installation successful and not the other?  

Which entity is incompatible with MSE?  HP Zbook or Win7 Professional?  

Thank you in advance for attending to this.

Robert Hoech