What this Win32:InstalleRex-BO [PUP] will bring to my computer? It has been detected by my anti-virus program several days before. Now every time I turn on my computer, I will receive a warning about this thing from the protection tool. I have tried many times to use the anti-virus to remove it without success. How do I get rid of this thing? I think it could damage my computer as it is reported by my anti-virus software.

Brief Introduction to This Trojan

Win32:InstalleRex-BO [PUP] is a malicious potentially unwanted program that can damage the infected system by corrupting the system files and weakening the security level and so on. It can be also classified as a Trojan infection which attacks Windows machines. For inexperienced computer users, they can hardly distinguish which website they could trust and which web page should not go. The makers of this infection can use the Internet to spread it to innocent computers all over the world. This Trojan infection can be implanted into many websites servers and the malicious scripts of it can also be added into those websites. People come to visit the infected websites will get infected immediately.

As a Trojan infection, it can come to victim’s computer with other free software and spam E-mails. While downloading other freeware on some unreliable resources, people can download this Trojan at the same time as hackers can embed this Trojan into those programs and when people install the download freeware on their computers, the executable file of the Trojan can also be run. In this case, it can be installed without user notice. People can also get infected this Trojan by opening infected attached file in an E-mail as hackers can send spam E-mails to computer users randomly. This Win32:InstalleRex-BO [PUP] can easily be detected by most of the present anti-virus programs. However, it is not easy for those protection tools to remove it as this Trojan is able to corrupt the system files which makes the tool is not able to remove.

Once this Win32:InstalleRex-BO [PUP] is activated on the infected computer, it will damage the system firewall as well, which means it can help many other computer viruses and Trojans to come to make further damage to the infected machines. This Trojan can add malicious and unknown plug-ins to the browsers on the infected computer which can generate many unwanted pop-ups during the use of the infected machine. Most of those pop-ups contain vicious contents. Except this, this nasty thing can slow down the performance of the computer, people will have a take a long time to launch programs and some can’t even be opened, also, PC user will get a slow Internet speed when they go online. Black screen and BSOD can happen frequently as the system files have already been damaged by this baleful Trojan.

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 Win32:InstalleRex-BO [PUP] 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:


Win32:InstalleRex-BO [PUP] is not good for Windows computers. It is categorized as Trojan infection which can damage the infected system severely. It can cause many unwanted problems and troubles to the infected system like countless pop-ups and slow performance. The infected computer will run abnormally and if this Trojan can’t be removed in time, the infected computer will get a complete crash as this Trojan can break the system files.

Suggestion: To follow removal guide that mentioned above, a level of computer knowledge is needed. Still can’t get out of Win32:InstalleRex-BO [PUP]? Contact online experts for help now!

Published by Tony Shepherd & last updated on June 30, 2014 5:50 am

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