How to Fix Widows Defender Error 0x800700AA on Windows

Many users report that the issue only occurs when running Windows Defender on Windows 10, while others report receiving the code 0x800700aa at startup. The problem only appears for some users when they run Windows Defender, while yet other users see the error code on every start-up attempt. Today we are talking about “How to Fix Windows Defender Error 0x800700AA on Windows 10.”After taking a closer look at this issue, it turns out that several different causes might be contributing to the occurrence of the 0x800700aa error code.

Solution 1: Fix the 0x800700AABA error in Windows by using SFC Tools (the System File Checker process).

1. Open the Start menu and search for Cmd (or press Win+S and search Cmd).
2. Right-click on “Command Prompt,” then “Open Run as Administrator.”
3. Enter the following command: “sfc /scannow”
4. The repair process takes several minutes to complete.

Note: Do not close the Command Prompt until verification is 100% complete.

Solution 2: Fix Windows Defender Error 0x800700AA by Using the DIMS Tool

DIMS stands for Deployment Image Servicing and Management.

1. Open “Start” and search “cmd” (or “Press Win key+S and search cmd”).
2. Right-click on “Command Prompt,” then “Open and Run as an Administrator.”
3. Type the “following command”, and then “press Enter”. DISM.exe/Online/Cleanup-Image/RestoreHealth
4. The repair process takes several minutes to complete.
5. After the DISM tool repairs your files, restart your PC.”

Solution 3: Enable Windows Defender in Safe Mode

DISM and SFC scans may haven’t fixed the issue in your case, but if they didn’t, the issue could be a conflict with one of the system files used by the built-in antivirus suite.

The same 0x800700AABA error has been encountered by some users when they start their computer in Safe Mode or launch the utility. Users managing to resolve the issue have reported rebooting the computer in Safe Mode and enabling the Security Suite for the operating system.

1. First, press the Win-R key to open the Run window, and then type msconfig into the text field. Press the Enter key to start the program. You can also find it using the Cortana search function.
2. Now, choose the Boot tab and check the box next to Safe Boot in the Boot options. Afterwards, click Apply and OK.
3. Use the Restart button if you want your PC to restart at the same time. If you want to restart your PC manually, you can click on Exit without restarting.

Solution 4: Fix the 0x800700AABA error by resetting Windows 11. 

1. Open “Settings” in Windows 11 (or “Press Win Key + I”).
2. Then click “Update & Security>Recovery.”
3. Click the “Restart button” (for the “Advanced option”).
4. Restart the system and select “Troubleshoot>Reset this PC.”
5. There are two options: Keep “my files” and “Remove everything.” Select the required option.
6. Enter your “username” and “password,” select the Windows version, and “insert Windows 11 installation media.”
7. Finally, click Reset.