This error can be caused by another security product or due to a failed install when the product is being upgraded to a newer version.

Symptoms of Norton Error 8504 and 101:

1. "Error 8504 101" appears and crashes the active program window.

2. Your PC frequently crashes with Error 8504 101 when running the same program.

3. “Norton Internet Security Error 8504 And 101” is displayed.

4. Windows runs sluggishly and responds slowly to mouse or keyboard input.

5. Your computer periodically “freezes” for a few seconds at a time.

Check all these issues if still you're troubled with rectification then Call support @ 800-864-4162

8504 101 error messages can occur in any of the following Microsoft Windows operating systems:

Windows 10
Windows 8
Windows 7
Windows Vista
Windows XP
Windows ME
Windows 2000
Steps to resolve Norton error 8504 and 101 are mentioned below:

Step 1: Repair Registry Entries Associated with Error 8504 101

Step 2: Conduct a Full Malware Scan of Your PC

Step 3: Clean Out Your System Junk (Temporary Files and Folders) With Disk Cleanup (cleanmgr)

Step 4: Update Your PC Device Drivers

Step 5: Utilize Windows System Restore to "Undo" Recent System Changes

Step 6: Uninstall and Reinstall the Norton Internet Security Program Associated with Error 8504 101

Step 7: Run Windows System File Checker ("sfc /scannow")

Step 8: Install All Available Windows Updates

Step 9: Perform a Clean Installation of Windows

Hopefully, your Norton error 8504 and 101 must have been resolved. Issue still not solved then call support @ 800-864-4162