What's concerning for me is not knowing what rights this "UpdatusUser" user account has. On the home versions of Window 7, the GPEDIT.MSC and RSOP.MSC tools are not available to research such a question or define limitations.
What if (more like WHEN) the password gets leaked to the public? A virus could then be written to target this VULNERABILITY .. because that's precisely what it is: A foreign account on your system having an unknown set of rights.
The "UpdatusUser" account not listed in the Control Panel User Accounts applet nor does it appear to be hidden using the "SpecialAccount" registry key. The only place, other than thoughout the registry, where it's visible is on the "nvUpdatusService" (NVIDIA Update Service Daemon) Windows Service where the account is assigned to Log On As ".\UpdatusUser"
This is a disastrous approach at patch management and done without the owner's clear understanding / approval.