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What is Windows Installer and do I need it for Windows XP?

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Windows Installer is the standard program for installing windows software.

It is required for any windows updates to be installed.

Also, a large proportion of windows software requires it in order to install.

So yes, you need it.

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How can one knw which version is installed and if I want to update which file do I need to download I don't get should i download all or none – user285oo6 Mar 27 '15 at 10:18

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