How to remove the Windows Serial Number Checker malware

Most antivirus programs classify getsn32.dll as a harmful extension to Internet Explorer: for instance not-a-virus:AdWare.Win32.BHO.cvf or not-a-virus:AdWare.Win32.BHO.dfe (detected by Kaspersky), and TrojanDownloader:Win32/Cadux.B or TrojanDownloader:Win32/Cadux.A (detected by Microsoft). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated Windows Serial Number Checker 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 Windows Serial Number Checker and how to get rid of it.

Click here to automatically remove the Windows Serial Number Checker malware

Getsn32.dll file information

The process known as Windows Serial Number Checker or Windows Explorer cdrom optimizer appears to belong to software Windows Serial Number Checker or Windows Explorer cdrom optimizer by Microsoft (

Description: Getsn32.dll is not essential for Windows and will often cause problems. Getsn32.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 15,360 bytes (77% of all occurrences) or 14,848 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 A55CA42C-BF8A-4491-9073-6E32FC4E6250 or 465C6E30-123E-4DFF-880A-4C396968EDB6 or 7 more variants. The program is not visible. It is located in the Windows folder, but it is not a Windows core file. The getsn32.dll file is able to change the behavior of, or monitor Internet Explorer. The service has no detailed description. The file is not a Windows core file. getsn32.dll appears to be a compressed file. Therefore the technical security rating is 70% dangerous.

Recommended: Identify getsn32.dll related errors

Important: You should check the getsn32.dll process on your PC to see if it is a threat. If Windows Serial Number Checker 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 getsn32 issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active getsn32 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the getsn32.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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

getsn32.dll [all]