This says it all really:
MobyTurbo writes "In an article on BSD Vault a careful reader posts that in the latest Windows Media Player security patch, the EULA (the "license agreement" you click on) says that you give MS the right to install digital rights management software, and the right to disable any other programs which may circumvent DRM on your computer." So if you want your machine secure, you also want microsoft to have free reign on your PC.
You can read the full article
here.
Install this patch and Microsoft will be able to control which programs you can run and what mp3's you can play. If you can, disable Media Player's access to the internet (should be doable with a decent firewall), or even better just don't use the damned thing.
: sharpens sticks :
Why you shouldn't install the Media Player patch
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