This is one of those optional Update related updates [know that sounds repetitive]. After installing found Compattelrunner.exe running constantly consuming CPU. It's listed with a few other KB numbers, but it was only after installing KB2952664 [win7 64] that I had this issue.
In case the KB used is different for your Windows install... Selecting History in the Windows Update dialog by default lists all updates sorted by date - right clicking gives the option for more information, & the Microsoft page that's linked should list the files added or updated, e.g. https://support.microsoft.com/en-us/kb/2952664
Updates are listed with or as part of the dialog where you remove programs. Uninstalling required a restart.