How to remove a Virus?

For every job there is a tool. You need a Removal software to get rid of those annoying application running on your Pc. Symantec offer free removal tools here. 

But these are not design to protect your Computer in real time so you also need a Spyware Ad Ware and Virus Computer Protection.  These powerful software are design to clean and remove any Malware On your Pc. 

The jdbgmgr.exe virus hoax involved an e-mail spam in 2002 that advised computer users to delete a file named jdbgmgr.exe because it was a computer virus. jdbgmgr.exe, which had a little teddy bear-like icon (The Microsoft Bear), was actually a valid Microsoft Windows file, the Debugger Registrar for Java (also known as Java Debug Manager, hence jdbgmgr).

Featuring so odd an icon among normally dull system icons had an unexpected counterpoint: an email hoax warning users that this is a virus that somehow came into your computer and should be deleted. This hoax has taken many forms and is always very popular among non-expert users that find this icon suspicious.

The email has taken many forms, including saying its purpose was to warn Hotmail users of a virus spreading via MSN Messenger, or even to alert about a possible virus in the orkut web community. All say that it was not detected by McAfee or Norton AntiVirus, which is obviously true.

This email in fact could be considered some kind of virus as it has all the normal life cycle of computer virus: It comes through user mailboxes, harm the system (by deleting a file) and then the message is forwarded to multiple recipients to reinfect them. Only that all those commands are executed by the user himself, making it a failproof virus (c.f. honor system virus). 

Virus Type

Worm

Worms can open a back door for those that wish to enter your computer and provide remote access to intruders. There are many different entrances into your computer (such as email), where they enter and can cause great harm. The worms use up bandwith and hinder's a computer's ability to function properly.

ILOVEYOU

Created by a group from Filipinos in the year 200, this virus has caused massive damage to many people around the world starting with the east. The ILOVEYOU worm is sent through email, it detected the reciever's email address book and was able to send it's self to others email so it would appear that it would be coming from someone you already know. People recieve the file from opening the email and downloading an attachment that ends with a .VBS. From there it takes multiple extension files, such as .JPG or .CSS and changes them to .VBS files. The ILOVEYOU worm also has the ability to download a program called "WIN-BUGSFIX.EXE" which causes your cached passwords to be mailed to certain hackers.

Mydoom

Also a very destructive worm and caused thousands of computers to be shut down for a while so it could be fixed. With it's primary source of transfering being through email, error messages often apperaring as a failed or error. Although the origional creator of the mydoom worm is unknown, what is known is the worm was first origianally created by a Russian programmer some time in early 2004 or late 2003. The first known time it was spotted was on January 26, 2004. The main purpose of this worm is to send spam email to all email users it can reach through infected address books. It also allows access to infected computers by a backdoor on port 3127. Third it was created to do a DOS (denial-of-service) attack against www.sco.com. Later variants of mydoom also blocked access to microsoft as well as antivirus websites.

Melissa

A mass mailing computer worm, the Melissa worm, was created by David L. Smith was first discovered on March 26, 1999. The Melissa worm was first opened through a porn site password page. It embedded itself in a file called List.DOC and was able to use the user's email to mail itself. Melissa used word documents to shield itself, but had a weakness when it came to certain word programs such as Word 95. Mailing itself was also limited to Microsoft outlook 97/98 and was unable to achive sending itself through microsoft Outlook Express. It was the macros in word that maid the worm possible. When you recieve the original worm through email this is what it shows you:

From: <name of the infected sender>

Subject: Important message from <name of sender>

To: <The recipients, from the 50 names>

Attachment: LIST.DOC

Body: Here is that document you asked for ... don't show anyone else ;-)

From there it was changed to Melissa.I/Empirical, to Melissa.O, Melissa.U, Melissa.V, Melissa.W and lastly Melissa.AO. Most of them show differences between each other with the same basics, but Melissa.A (the original) and Melissa.W are believed to be the same. All of them have caused serious harm and still continue to harm users computers.

Trojan horse

A Trojan Horse is an email virus usually released by an email attachment. If opened, it will scour your hard drive for any personal and financial information such as your social security, account, and PIN numbers. Once it has collected your info, it is sent to a thief’s database.

The term comes from the a Greek story of the Trojan War, in which the Greeks give a giant wooden horse to their foes, the Trojans, ostensibly as a peace offering. But after the Trojans drag the horse inside their city walls, Greek soldiers sneak out of the horse's hollow belly and open the city gates, allowing their compatriots to pour in and capture Troy.

Trojan horses are almost always designed to do various harmful things, but could be harmless. They are broken down in classification based on how they breach systems and the damage they cause. The seven main types of Trojan horses are:

-Remote Access Trojans

-Data Sending Trojans

-Destructive Trojans

-Proxy Trojans

-FTP Trojans

-security software disabler Trojans

-denial-of-service attack (DoS) Trojans

One thing you probably won't find a Trojan doing is scouring your hard drive for personal details, as the Visa description alleges. Contextually, that would be a bit of a trick for a Trojan. Instead, this is where the keylogging functionality most often comes into play - capturing the user's keystrokes as they type and sending the logs to the attackers. Some of these keyloggers can be pretty sophisticated, targeting only certain websites (for example) and capturing any keystrokes involved with that particular session.