Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
Trojan.svchost is spreading through LimeWire P2P, which shows a fake message like "The setup file is corrupted". Later it creates a file in Global startup and start to phoning home.It phones home to different domains on its each execution.
Trojan will not allow the user to access Task manager and Regedit (Windows Registry Editing utility)