The WindowService Trojan is malware program that is commonly installed by adware bundles that you download from the Internet. When installed, the Trojan will extract numerous executables to the %Temp% folder and create a service that launches one of them when Windows starts. These Trojans are used to log information about the computer and to potentially download other software onto the computer.
This article was published first at Remove the WindowService Trojan
Source: Bleeping Computer