The file m2trayhook.dll belongs to the Window Manager utility from Gibin Software House. This file is part of the system that allows a user to hide programs in the tray instead of on the Taskbar. Window Manager is freeware and part of GiPo@DesktopUtilities.
At least one version of this software has been reported to contain spyware, so if you have this file on your machine, you may want to run a free scan with SpyZooka. If your copy of the software is clean, but you are still getting an error, run ZookaWare PC Cleaner to fix the problem.
ZookaWare PC Cleaner is a registry cleaner. The Windows registry contains entries about all the installed programs on your computer, including all dynamic link library files. If the data in the registry does not match the installation on your machine, you will get an error. ZookaWare PC Cleaner finds and fixes the error, making your software run correctly again.