Startupchecklibrary.dll is a file associated with Windows although sometimes malware can appear as such a legitimate file. Removing it will not harm your operating system and it is advised to do so.


Startupchecklibrary.dll can be a trojan horse in disguise of a legitimate windows file.

A new Trojan has been recently reported to our “How to remove” team, and this time the malware goes under the name of Startupchecklibrary.dll. If you are reading this article because your personal computer has been secretly compromised by this particular Trojan, it is best to quickly figure out how to detect and eliminate it. Trojans, especially the new and sophisticated versions like Startupchecklibrary.dll, can be very unpredictable and can damage your entire system before you know it. Fortunately, we are here to help you prevent that and deal with the malware ASAP. As a start, we will first point you towards the information in the next paragraphs, just to help you get an idea of how serious the infection with Startupchecklibrary.dll can be. Next, we recommend you to take a look at the removal guide at the end of the article, and at the attached professional removal tool. Ideally, with their help, you should be able to remove the Trojan from your system.

There was a problem starting Startupchecklibrary.dll

Startupchecklibrary.dll is a new malware variant of the Trojan Horse type that can compromise your computer without your knowledge and launch a number of harmful processes on it. Typically, Trojans are used for espionage and BitCoin mining, but some of them can also distribute Ransomware.

Like most malware programs and viruses, the Trojans typically use a blend of different infection methods, and a variety of transmitters, which can deliver the harmful code into your system. Their goal is to sneak in without getting detected, and in order to achieve that that, they typically use some common types of web content (such as ads, pop-ups, email attachments, social media links and messages, torrents, free downloads, etc.) as disguise. One careless click on a random pop-up message may easily inject an infection like Startupchecklibrary.dll into your computer without showing any visible symptoms. Therefore, we always advise our readers to be careful while browsing the web and to not click on shady sites and links, too-good-to-be-true offers, suspicious deals, or clickbaits.

Unfortunately, this is usually not enough to fully protect you from an accidental encounter with a representative of this category. Therefore, investing in reliable antivirus software is always a good idea. In fact, in most cases, it is very difficult to detect and remove the Trojan without the help of a professional security tool, because these threats are very good at hiding themselves in unusual system locations. An infection like Startupchecklibrary.dll, for instance, may mimic some regular system processes or files. What is more, an advanced Trojan of this kind may silently operate in the background of the OS and launch different harmful activities without your knowledge.  

The infection methods associated with Trojans.

Trojans are stealthy – they use camouflage and can operate in secret for an indefinite period of time. But what makes them even more feared is the fact that they can be used for a long list of criminal actions. The harmful capabilities of threats like Startupchecklibrary.dll are limitless. They can be programmed to perform one harmful activity after the other, and there is no way of knowing what can happen to your computer. The criminals who are in control of the malware can use it to gain full remote access to your machine. They may also use it to hack into your webcam, or mic, and secretly spy on you. Trojans are also a malware type oftentimes used to spread Ransomware cryptoviruses, to perform identity thefts, and to conduct banking frauds. Through a method known as keylogging, the Trojans can steal your passwords, login credentials, credit or debit card numbers, and other sensitive information. They can transmit data from your computer to remote servers without your knowledge, but what is even worse is they can modify, replace, remove or destroy all the information stored on the infected machine.


Name Startupchecklibrary.dll
Type Trojan
Danger Level High (Trojans are often used as a backdoor for Ransomware)
Symptoms Trojans rarely show visible symptoms, thus, detecting them usually requires the help of a professional security program.
Distribution Method Spam, pirated content, cracked software, malicious ads and offers, misleading links, illegal websites, torrents.
Detection Tool

Startupchecklibrary.dll Virus Removal

If you are looking for a way to remove Startupchecklibrary.dll you can try this:

  1. Click on the Start button in the bottom left corner of your Windows OS.
  2. Go to Control Panel -> Programs and Features -> Uninstall a Program.
  3. Search for Startupchecklibrary.dll and any other unfamiliar programs.
  4. Uninstall Startupchecklibrary.dll as well as other suspicious programs.

Note that this might not get rid of Startupchecklibrary.dll completely. For more detailed removal instructions follow the guide below.

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide


Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).



Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 


Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Each file will be scanned with up to 64 antivirus programs to ensure maximum accuracy
This scanner is free and will always remain free for our website's users.
This file is not matched with any known malware in the database. You can either do a full real-time scan of the file or skip it to upload a new file. Doing a full scan with 64 antivirus programs can take up to 3-4 minutes per file.
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    After you open their folder, end the processes that are infected, then delete their folders. 

    Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 


    Hold together the Start Key and R. Type appwiz.cpl –> OK.


    You are now in the Control Panel. Look for suspicious entries. Uninstall it/them. If you see a screen like this when you click Uninstall, choose NO:



    Type msconfig in the search field and hit enter. A window will pop-up:


    Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.

    • Remember this step – if you have reason to believe a bigger threat (like ransomware) is on your PC, check everything here.

    Hold the Start Key and R –  copy + paste the following and click OK:

    notepad %windir%/system32/Drivers/etc/hosts

    A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

    hosts_opt (1)

    If there are suspicious IPs below “Localhost” – write to us in the comments.


    Type Regedit in the windows search field and press Enter.

    Once inside, press CTRL and F together and type the virus’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

    • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
      HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
      HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

    If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!


    About the author


    Brandon Skies

    Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. Years of experience enable him to provide readers with important information and adequate solutions for the latest software and malware problems.

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