This morning my Windows 7 computer notified me that an update was available (my Windows update setting is to notify me, not to automatically install updates), and it identified it as "Google, Inc.- ACER Composite ADB Interface" (or very similar, as I recall). I did some searching online and decided not to install this update, as others with the Nexus 7 have had problems connecting to their computer after installing this update. I do not own any Acer products, so I can only guess that Windows (mistakenly) sent me this update because I have drivers installed for my Nexus 7.
Here is a thread from another site with posts about this issue: Windows 8.1 Device Manager now showing ACER Device rather than Android Device for Google Nexus 7 - Stack Overflow
Here is a thread from another site with posts about this issue: Windows 8.1 Device Manager now showing ACER Device rather than Android Device for Google Nexus 7 - Stack Overflow