The file p2pgasvc.dll is the Peer-to-Peer Group Authentication Service created by the Microsoft Corporation. This is a standard file that allows Windows to participate in peer-to-peer connections.
If you are seeing an error with this file, you may not be able to use peer-to-peer on your machine. Short of reinstalling Windows, your best option to fix this issue is to clean your registry.
The registry is Windows way of keeping track of itself. Every file installed on your computer has an entry in the registry that tells Windows where the file lives and how to use it with any programs that need it. When mistakes creep into the registry, Windows loses track of files and your software doesn’t run.
ZookaWare PC Cleaner cleans up your registry. ZookaWare PC Cleaner finds all those mistakes and fixes them so Windows knows where to find your files. Check your registry now with a free ZookaWare PC Cleaner scan, and see if you need a registry cleaning.