Most antivirus programs identify cd.exe as malware—for instance F-Secure identifies it as Application.Generic.1551043 or Gen:Variant.Adware.Kazy, and Avast identifies it as Win32:FakeDownload-E [PUP].
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Description: Cd.exe is not essential for Windows and will often cause problems. The file cd.exe is located in a subfolder of "C:\Program Files".
Known file sizes on Windows 10/8/7/XP are 606,936 bytes (53% of all occurrences), 508,632 bytes or 1,109,504 bytes.
The file is not a Windows system file. The program is not visible. Cd.exe is certified by a trustworthy company. Cd.exe is able to monitor applications. Therefore the technical security rating is 45% dangerous.
Recommended: Identify cd.exe related errors
Important: You should check the cd.exe process on your PC to see if it is a threat. If Content Defender Main Service 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 ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active cd process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the cd.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 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.