you don't think steam or whoever downloaded and adjusted your computer ?? when you agreed the the terms you agreed to ''with out limitation'' of your system weather it harms you or not
For reasons that include, without limitation, system security, stability, and multiplayer interoperability, Steam may need to automatically update, pre-load, create new versions of or otherwise enhance the Software and accordingly, the system requirements to use the Software may change over time. You consent to such automatic updating. You understand that this Agreement (including applicable Subscription Terms) does not entitle you to future updates, new versions or other enhancements of the Software associated with a particular Subscription, although Valve may choose to provide such updates, etc. in its sole discretion.
http://store.steampowered.com/subscriber_agreement/
with out limitation -- that's the best part
origin does claim to let you opt out of that but there more insterded in collecting your data [ they say right up front ''were not spyware''] ya ok..