Slack is a work-messaging client that ships both a desktop app and a per-user updater. Because it drops files in three different locations—Program Files, AppData\Local, and AppData\Roaming—and registers itself to start with Windows, the built-in “Uninstall” button almost always leaves behind cache folders, update tasks, and shell-extension DLLs. Those remnants can reinstall the app the next time Windows Update runs or simply chew up disk space.
Follow these steps to wipe Slack from a Windows 10/11 PC for good.
- Close Slack completely
Right-click the Slack icon in the system tray and choose Quit. If it refuses, open Task Manager (Ctrl + Shift + Esc) and end every process whose name starts with “Slack”. - Remove the main package
• Settings → Apps → Installed apps → Slack → Uninstall → confirm.
If the entry is missing, open Control Panel → Programs → Programs and Features → Slack → Uninstall . - Delete the user-level leftovers
Open File Explorer and delete the following folders (copy-paste the paths):
- %LOCALAPPDATA%\slack
- %APPDATA%\slack
- C:\Program Files\Slack (or C:\Program Files (x86)\Slack on 64-bit systems)
- Stop the updater task
Press Windows + R → taskschd.msc → Task Scheduler Library → look for a task named SlackUpdateTask or similar → right-click → Delete. - Tidy the registry (optional but thorough)
regedit → navigate to
- HKEY_CURRENT_USER\Software\Slack
- HKEY_LOCAL_MACHINE\SOFTWARE\Slack
Delete those keys after exporting a backup.
- Reboot
Restarting flushes any locked DLLs and ensures the Start-up list is rebuilt without Slack.
If you’d rather not hunt through folders and the registry, run PerfectUninstaller afterward—it will locate every hidden Slack remnant and erase them in one click.
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