I need help stopping a black command window from appearing when I sign into my laptop.

A black C:\Windows\System32 command window at sign-in is commonly caused by a startup item or scheduled task launching Command Prompt.

A practical way to isolate it is a clean boot:

1. Press Windows + R, type msconfig, and press Enter.
2. In System Configuration, open the Services tab.
3. Select Hide all Microsoft services.
4. Select Disable all.
5. Open the Startup tab and select Open Task Manager.
6. Disable each startup item.
7. Restart the laptop.

If the pop-up stops after restart, one of the disabled startup items or non-Microsoft services is causing it. Re-enable items in small groups until the black window returns to identify the exact program.

If the pop-up still appears, check for a scheduled task or startup entry that points to an unwanted command:

1. Download Autoruns.
2. Run Autoruns64.exe as administrator.
3. Let the scan finish.
4. Review startup entries and scheduled tasks for anything suspicious or anything that launches Command Prompt from an unexpected path.
5. Disable or remove the matching entry.

If the issue is tied to a specific file or folder name shown in the window, use Autoruns Quick Filter to search for that name and remove the matching entry.

References:

• Context System 32 keeps showing up every now and again on my pc and takes me out of whatever I was tabbed into - Microsoft Q&A
• Context Command prompt popping up and disappearing immediately Windows 10 - Microsoft Q&A
• Context Microsoft Windows [Version 10.0.22621.4317] (c) Microsoft Corporation. All rights reserved. C:\Users\Admin> - Microsoft Q&A