Is there any method that I can trust to get rid of this PUP.Optional.OpinionSquare.A? It has troubled me for a long time on my computer. I have used different anti-virus software to get it removed but none of them can help. It can be always back after I restart my computer. How can I eradicate this stuff permanently and completely? I don’t want it to mess up my information saved on my computer. Please advise.

Brief Introduction to This Trojan

PUP.Optional.OpinionSquare.A is defined as a potentially unwanted program that needs to be handled properly. If not, it can cause many severe problems to the infected computers. Technically speaking, it is a kind of Trojan horse infection as well. Cyber hackers design this kind of infection to fulfill some specific purposes like increasing some sponsored links’ ranking on the Internet, giving fake coupons to computer users and luring victims to pay for useless items and generating tons of advertisements. It is not a good stuff for computer users to trust as when it shows to users can help other kinds of computer threats to infiltrate the corrupted computers and make further damages to the system. People who have been noticed by anti-virus programs about this infection need to remove it in time to avoid other troubles.

As a Trojan infection, this PUP.Optional.OpinionSquare.A can be easily caught by anti-virus programs, however, it doesn’t mean that all the security tools have the ability to remove it completely for users. That’s to say, this Trojan infection can hide on the infected computers for a long time without being removed even it has already been detected by the security software. What’s worse, this Trojan can be able to ban the tools installed on the computers from the start up. It can mess up the system registry, it can add its data into it and change other system settings in it which can make the security tools disabled. In this case, the infected machines can be suffered from many other computers problems. This Trojan can even infected system files to avoid being detected by anti-virus programs.

Usually, this Trojan can be distributed by cyber hackers on the World Wide Web, they can hack into websites and edit the malicious scripts of this infection into the pages, so when people come to visit the infected websites, this Trojan can be downloaded as a cache files by computers. Also, hackers can bundle it with other programs and publish the corrupted software to the web for users to download. When unsuspecting computer users download the problematic programs to their computers and install them, this Trojan can be installed at the same time. Once it is installed, it can be activated immediately on the background.

Some Traits about This Trojan

-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.
-Cay give you many redirects all the time no matter what you are doing.
-May pretend as an anti-virus program and cheat you that computer is in dangerous, and ask you to pay to remove the threats.

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 this PUP.Optional.OpinionSquare.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 this Trojan, and delete them all.

Step 4: Click on Start button at the right lower corner, then click on Control Panel


Then you will come to the Control Panel windows, click on Add and Remove Programs


Then try to find the program which relates to this Trojan, highlight it and choose Remove, the program’s name is random.


Step 5: 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.OpinionSquare.A is a noxious Trojan infection that can cause many problems to the infected computers. It is a kind of computer infection that can come to the innocent computers silently. With this infection running at the background, the performance of the infected machine can be slowed down and users will get many sudden problems during the use. If it cannot be removed as soon as possible, it can help many other computer viruses to come.

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

Published by Tony Shepherd & last updated on December 31, 2014 1:13 pm

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