Registry entry to check version of current installed Office?

I need to check if MS Office is currently installed on my machine and which version of Office is installed. What are the registries to check this?

Earlier I was relying on below registry entry for this:

HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Common\LastAccessInstall 

But in some cases, the registry is missing even though Office is installed.

Parul Gupta