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.
This memory-resident downloader Trojan is designed to terminate firewalls and anti-virusses
Double-click the My Computer icon.
Double-click the folder %Window% >SIMCSS, WINTRIM, or NAVPMC.
Note: %Windows% is the Windows directory, which is usually C:\Windows or C:\WINNT.
Double-click the UNINSTALL.EXE file.
These files need to go but one of them is running in memory - so you need to kill the process before Windows will allow you to delete it.
Press Control ALT Delete and look for the process called.