MSI is installed on all modern OS'es, no?
the only question is what is the version of it.

try this for some info:
Code:

$=createobject("windowsinstaller.installer")
if vartype($)=9
 $.version ?
else
 "weird, no installer object available" ?
endif
get $

for example, on my machine it gives 2.0.2600.1183
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