How to remove Mournor?
What is Mournor?
Mournor trojan is annoying and it is capable of messing up Windows operating system. Fortunately, this infection can be avoided easily; Mournor has to be executed manually. Unfornately, the trojan tricks people into running the malware. Mournor trojan arrives as explorer.exe file, but the icon of this file suggests that it’s actually an image. Whoever is curious enough to run the file gets the Mournor. Mournor is also detected as Trojan.Mournor by some security tools.
Once executed, Mournor either deletes or renames and hides original Windows explorer application. It inserts copy of itself (explorer.exe) instead of the real program. It also creates malicious files on SYSTEM directory. This may result system crashes and other inconveniences. The trojan makes necessary changes in registry to run on boot. Trojan.Mournor may install other malware.
Mournor is Dangerous
Mournor is a Trojan parasite
Mournor may display fake security & messages
Mournor may display numerous annoying advertisements
Mournor may be remotely controlled by a malicious person
Mournor may spread additional spyware
Mournor may repair its files, spread or update by itself
Mournor may prove difficult or impossible to remove
Mournor violates your privacy and compromises your security
for Mournor detection
Note: Spyware Doctor trial provides detection of parasite like Mournor and assists in its removal for free. You can remove detected files, processes and registry entries yourself or purchase a full version.
Manual Mournor removal
Important Note: Although it is possible to manually remove Mournor, such activity can permanently damage your system if any mistakes are made in the process, as advanced spyware parasites are able to automatically repair themselves if not completely removed. Thus, manual spyware removal is recommended for experienced users only, such as IT specialists or highly qualified system administrators. For other users, we recommend using Spyware Doctor or other malware and spyware removal applications found on 2-viruses.com.
Stop these Mournor processes:
Remove these Mournor Registry Entries:
Remove these Mournor files:
It is impossible to list all file names and locations of modern parasites. You can identify remaining parasites, other Mournor infected files and get help in Mournor removal by using free Spyware Doctor scanner. It comes with free real-time protection module that helps preventing Mournor and similar threats.
Such Trojans as Mournor generally infect your system while you are installing a game, opening a picture or playing a video file.
Some Trojans such as Mournor masquerade themselves as useful freeware programs or plug-ins, but are actually bundled Trojans.
As soon as it infects your system, Trojan Mournor gives COMPLETE control over your system to a hacker using the Trojan, who may cause serious damage to your system. A Trojan may alter your desktop or add undesirable shortcuts to various commercial and marketing sites; Mournor is no exception. It may create a backdoor to your system, allowing the hacker to control your system and steal your personal information. Unlike viruses and worms, Trojans like Mournor do not reproduce by infecting other files nor do they self-replicate and each new victim must run the infected file.

Thanks for the Info.
I just wanna add that after cleaning the system by applying the above instruction .. you will need to clean your hard drives, flash memory, camera storage card, mobile storage card & other stuff .. search for the following files
AUTORUN.INF
MOURN_OPERATOR.EXE
Example :
C:\autorun.inf
C:\mourn_operator.exe
D:\autorun.inf
D:\mourn_operator.exe
& the same for other drive ..
those files will be Hidden
you can use the following MS-Dos codes to delete them
to check the files type
dir /a
to delete the files
del /a /f autorun.inf
del /a /f morun_operator.exe
Have fun