What is Bu_.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the Bu_.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Bu_.exe file information

The process known as Yahoo! Toolbar Uninstall Setup belongs to software unknown by Yahoo! (

Description: Bu_.exe is not essential for Windows and will often cause problems. Bu_.exe is located in a subfolder of Windows folder for temporary files. Known file sizes on Windows 10/8/7/XP are 2,993,530 bytes (25% of all occurrences), 36,234 bytes, 103,989 bytes or 63,925 bytes. 
The file is a file with no information about its developer. The file is not a Windows core file. The program is not visible. Bu_.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 63% dangerous, however you should also read the user reviews.

Recommended: Identify Bu_.exe related errors

If Bu_.exe is located in a subfolder of the user's profile folder, the security rating is 46% dangerous. The file size is 77,353 bytes (33% of all occurrences), 496,745 bytes or 85,093 bytes. There is no description of the program. It is not a Windows core file. The program is not visible. Bu_.exe is able to monitor applications.

Important: Some malware camouflages itself as Bu_.exe. Therefore, you should check the Bu_.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.


User Comments

It was eating up 46% of my CPU. No executable belongs in my Documents-and-settings, especially without identification. Get rid of it. (That may not be easy.)
  Tom Green  
Ich weiß nichts über die Bu_.exe Aber ich bin Administrator und kann trz. nicht in C:\Documents and settings

Summary: Average user rating of Bu_.exe: based on 2 votes with 2 user comments. One user suspects danger. One user thinks Bu_.exe is dangerous and recommends removing it.

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Best practices for resolving Bu_ issues

A clean and tidy computer is the key requirement for avoiding problems with Bu_. 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.

To help you analyze the Bu_.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

Bu_.exe [all]