If you have Automatic Update turned on:
” Users of Windows 7 Service Pack 1 (SP1), and 64-bit version of Windows Server 2008 R2 SP1 will receive Internet Explorer 10 as an important update if they have Automatic Updates enabled, or if they perform a manual scan for updates on Windows Update.”
NOTE: installations which use “WSUS” – Windows Server Update Services” and control the updates to their installations can easily block this. For individual PC’s NOT being managed by WSUS (most of us 😉 there is a “blocker kit“.
Here is the direct download: IE10-BLOCKER