My computer was doing great in last few days, but now, it’s totally messed up! I’m not sure what is going on, I’m not a computer literate person. But I can find that recently my computer have been installed a stuff called PUP.Optional.NetLiker.A, and I don’t know where it comes from, so I try to delete it by my own, but I can’t. Can some people help me to remove it from my computer? I really need help to get rid of it.

Something You Need to Know about This Thing

PUP.Optional.NetLiker.A (in this article, we will use PUP as an abbreviation for this Trojan)comes to your computer as an optional program when you are trying to install other ‘free’ program which you downloaded from the Internet. It is always bundled with other bigger programs. People always need to install all kinds of softwares into their computers for some reasons. Internet plays as a beneficial place for people to get all programs they needed, in the meanwhile, bad things become mixed with the good resource. Cyber criminals can tamper usable softwares and put vicious stuffs into them. So during the installation, people can be asked to have a choice about the optional programs to be installed into computer, without a careful reading about that, some useless programs can be added into. Therefore, some bad things may happen to those computers. Also, this PUP can come to your computer in this way. On the other way, computer can be infected by this PUP while the user is visiting some malicious websites, as you can see, virus, Trojan or other threats can invade your computer if there is a connection with the Internet. Hackers can put those bad things in websites, when people try to visit those pages, virus can come to the computer automatically.

PUP.Optional.NetLiker.A is classified to Trojan which does great damage to computer. Once this PUP infiltrates into the victim’s computer, the first thing as all Trojans will do, is to modify the system registry, this act is trying to stop the update of the anti-virus tool, and prohibit many programs to run ,including many system essential processes. In this way, this PUP cannot be detected by the security protection program, and can mislead people to trust it belongs to good software or something harmless. With the help of this PUP, many other threats such as browser hijacker, malware or other viruses can infect your computer easily. Except making shortcut for those threats, many other garbage files can also be saved in your hard drive. Within these whole lousy things, your computer can be slower and slower, just like a snail. When you are trying to get something opened, it always takes a lot of time or even can’t be run as some errors occur, to the worst, your computer can suddenly turn into blue screen when you are doing some work on it.

In addition, with this PUP, your browser may get trouble at the same time. When you try to open your browser and search for something, you may get redirect to some other websites which have already been set in PUP. Mostly, those pages provide many advertisements to you and lure you buy products from them. Actually, those promotions cannot be trusted. Personal information can be easily leaked out to cyber criminals who can access to your computer with the help of Trojan. Any input may be recorded by Trojan and can be collected by hacker for illegal use.

Some Traits about This PUP
-Can slow down the performance of the computer, or even blue screen.
-Can create many junk files which occupy a lot of space in hard drive
-Can download other malicious programs into computer, which make further damage.
-Your sensitive information can be stolen by hacker who can access to your computer with the help of this Trojan.
-May pop up many advertisements, also, many redirects may happen.

NOTE: If you find any of these symptoms on your computer, that proves your PC is under attack and seriously infected. If you are not a computer savvy,Please contact YooSecurity Online PC Experts to remove PUP.Optional.NetLiker.A for you.

Manual Removal Guide of Trojan (For Computer Literate)

There is a removal guide of Trojan provided here; however, expertise is required during the process of removal, please make sure you are capable to do it by yourself.
Step 1: Find Ctrl, Alt, and Delete these 3 keys and then press them together to open task manager to end the process related to this Trojan, the name of the process of it is random.
XP task manager

Step 2: Try to find Folder Options in Control Panel, select the View tab, and then tick Show hidden files and folders and non-tick Hide protected operating system files (Recommended) and then click OK.

Step 3: Try to find the files which relate to the PUP.Optional.NetLiker.A, and delete them all.
Step 4: Click on Start button or press Win+R, then type regedit in the box to open Registry Editor, after that, try to find
C:\Users\profile name here\AppData\
Similar video guide to modify Windows registry:


PUP.Optional.NetLiker.A can be recognized as a Trojan threat in computer. Once it comes to computer, the registry and many important settings can be changed. Anti-virus tools which have been installed before will get void from protecting computer. Trojan can make a short way to let other threats to be downloaded automatically, which make a further damage to computer. Also, your sensitive information can be collected by hackers. To make the situation more complicated, many computer system files can be removed by this Trojan, and some fatal errors may happen if you don’t remove this Trojan as quickly as possible.

Suggestion: To follow removal guide that mentioned above, a level of computer knowledge is needed. Still can’t get out of PUP.Optional.NetLiker.A? Contact online experts for help now!

Published by Tony Shepherd & last updated on December 20, 2013 6:58 am

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