How to remove the SysDir virus

Most antivirus programs identify SysDir.exe as malware—such as Microsoft identifies it as MonitoringTool:MSIL/TBKeylogger, and Symantec identifies it as Trojan.Gen.2.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

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SysDir.exe file information

The process known as SysDir belongs to software The Best Keylogger or SysApp by Microsoft (

Description: SysDir.exe is not essential for Windows and will often cause problems. SysDir.exe is located in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 4,764,672 bytes. 
The program is not visible. The software starts when Windows starts (see Registry key: MACHINE\Run). SysDir.exe is not a Windows core file. SysDir.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 50% dangerous.

Recommended: Identify SysDir.exe related errors

If SysDir.exe is located in a subfolder of the user's profile folder, the security rating is 42% dangerous. The file size is 5,752,832 bytes. The program can be uninstalled in the Control Panel. The process has no file description. The program has no visible window. The application is loaded during the Windows boot process (see Registry key: MACHINE\Run). It is not a Windows system file. SysDir.exe is able to record keyboard and mouse inputs.

Uninstalling this variant: If you still experience problems with SysDir.exe, you can uninstall the software The Best Keylogger using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Important: You should check the SysDir.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving SysDir issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active SysDir process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the SysDir.exe 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

SysDir.exe [all]