>> At OS starting from XP (XP, W2K3 and Vista) this runtime *must* be
>> installed
>> properly.
>
> Does this mean regsvr32 type properly install?

Of course not. If you want to know exactly what MS understands as
"properly install", you may read MSDN about how to install shared assemblies.
But hurry - they may change rules at any time, as they usual do.

Else you may use runtime redistributable package and install it (properly
of course ;)

Regards,
Vlad