g2winlogon.dll is part of GotoMyPC. Have you checked out this software or seen ads for it? GotoMyPC allows you to access your desktop from anywhere. It is very helpful to the technophile and people working from home.
Whether you were deliberately trying to access this software or just looking at the advertisements for it, you may be experiencing an error message associated with DLL file g2winlogon.dll.

Since Microsoft’s not responsible for this DLL’s creation, make sure your computer is not suspect to malicious intruders because DLL files that are still under investigation appearing on your screen in the form of errors should make you nervous.

ZookaWare PC Cleaner is the top of the line for registry scanning, and their program can determine if anything in your hard drive is malicious or interfering with the proper functions of your computer.