What is AMBDef.Exe?

The genuine AMBDef.Exe file is a software component of Service Provider Interface (SPI) Restore Application by Creative Technology.
"AMBDef.exe" is an executable file, located in Windows and known as Service Provider Interface (SPI) Restore Application for SoundBlaster X-FI MB software by Creative Technology. It stands for Advanced Memory Buffer Definition, in which it defines specific functions/calls within the advanced memory buffer. Since the file is SPI (NOT Serial Peripheral Interface, but actually Service Provider Interface) related, it defines interfaces, classes, and methods that it extends to the operating system to allow successful integration. This permits the SoundBlaster X-Fi MB software to communicate with and share resources with the running Windows operating system. It lets both the file and the program control and utilize certain functions within existing sound boards or sound cards verses their standard processing functions. SoundBlaster X-FI MB software is a program that enhances audio sound from standard boards or cards, which is why the SPI Restore Application known as "AMBDef.exe" is required. Creative Technology® got their start in 1981 with a focus on audio processing through PC card devices and software. They created the SoundBlaster series of audio products, as well as the Audigy series that revolutionized the way audio is processed and heard on a PC. Now they produce many devices, including headphones, wireless speakers, digital audio sound cards, enhanced audio software products, and tons more.

AMBDef stands for Advanced Memory Buffer Definition

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 AMBDef.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.

Click to Run a Free Scan for AMBDef.Exe related errors

AMBDef.Exe file information

Windows Task Manager with AMBDef
AMBDef.Exe process in Windows Task Manager

The process known as SPI Restore Application belongs to software SPI Restore Application by Creative Technology (

Description: AMBDef.Exe is not essential for the Windows OS and causes relatively few problems. AMBDef.Exe is located in the C:\Windows folder. The file size on Windows 10/8/7/XP is 53,248 bytes. 
The process starts when Windows starts (see Registry key: MACHINE\Run). The AMBDef.Exe file is not a Windows system file. Therefore the technical security rating is 34% dangerous.

Recommended: Identify AMBDef.Exe related errors

Important: Some malware disguises itself as AMBDef.Exe, particularly when not located in the C:\Windows folder. Therefore, you should check the AMBDef.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 AMBDef issues

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

AMBDef.Exe [all]