Most antivirus programs identify WinReg.exe as malware—e.g. Kaspersky identifies it as Worm.Win32.Carrier.lc or Worm.Win32.VBNA.b, and Microsoft identifies it as Backdoor:Win32/IRCbot.DL or VirTool:Win32/VBInject.gen!BW.
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Description: WinReg.exe is not essential for Windows and will often cause problems. The file WinReg.exe is located in a subfolder of "C:\Program Files".
The file size on Windows 10/8/7/XP is 872,448 bytes.
The program has a visible window. The software has no file description. The application starts when Windows starts (see Registry key: Run, DEFAULT\Run). The file is not a Windows system file. WinReg.exe appears to be a compressed file. Therefore the technical security rating is 26% dangerous.
Recommended: Identify WinReg.exe related errors
If WinReg.exe is located in the C:\Windows\System32 folder, the security rating is 90% dangerous. The file size is 594,432 bytes. There is no file information. It is an unknown file in the Windows folder. The program is not visible. The process uses ports to connect to or from a LAN or the Internet. WinReg.exe is not a Windows system file. WinReg.exe is able to hide itself.
If WinReg.exe is located in a subfolder of the user's profile folder, the security rating is 74% dangerous. The file size is 137,728 bytes. There is no information about the author of the file. The program has no visible window. The process listens for or sends data on open ports to a LAN or the Internet. It is not a Windows system file. WinReg.exe is able to monitor applications.
External information from Paul Collins:
There are different files with the same name:
Important: You should check the WinReg.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.
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active WinReg process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the WinReg.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.