How to remove the Plus-HD-4.9 BHO malware

Some anti-malware programs classify Plus-HD-4.9-bho.dll as a harmful extension to Internet Explorer: for example Adware.Crossid (detected by Symantec), and ADW_CROSSID (detected by TrendMicro). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated Plus-HD-4.9 BHO software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about Plus-HD-4.9 BHO and how to get rid of it.

Click here to automatically remove the Plus-HD-4.9 BHO malware

Plus-HD-4.9-bho.dll file information

The process known as Plus-HD-4.9 BHO belongs to software Plus-HD by Plus HD.

Description: Plus-HD-4.9-bho.dll is not essential for the Windows OS and causes relatively few problems. Plus-HD-4.9-bho.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 644,968 bytes (62% of all occurrences) or 641,384 bytes. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include 11111111-1111-1111-1111-110411591118. The program is not visible. The file is able to change the behavior of, or monitor Internet Explorer. It is certified by a trustworthy company. The Plus-HD-4.9-bho.dll file is not a Windows system file. Plus-HD-4.9-bho.dll is able to monitor applications. Therefore the technical security rating is 56% dangerous.

Uninstalling this variant: If you are having problems with Plus-HD-4.9-bho.dll, you can uninstall the associated program (Start > Control Panel > Uninstall a Program > Plus-HD).

Recommended: Identify Plus-HD-4.9-bho.dll related errors

Important: Some malware camouflages itself as Plus-HD-4.9-bho.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example Adware.Crossid (detected by Symantec), and ADW_CROSSID (detected by TrendMicro). Therefore, you should check the Plus-HD-4.9-bho.dll process on your PC to see if it is a threat. If Plus-HD-4.9 BHO has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


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Best practices for resolving Plus-HD-4 issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active Plus-HD-4 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the Plus-HD-4.9-bho.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

Plus-HD-4.9-bho.dll [all]