Task Manager crashes immediately on my main Windows account

Because Task Manager works in another administrator account, the problem is likely isolated to the main user profile rather than the system-wide Taskmgr.exe binary.

Use this order:

1. Reset the per-user Task Manager settings
   • Delete this folder from the affected account: %LOCALAPPDATA%\Microsoft\Windows\TaskManager
   • Then sign out and sign back in, or restart Windows.
   • This matches a reported fix for Task Manager crashing on one profile.
2. Check for third-party service interference with that profile
   • Run msconfig.exe.
   • Open the Services tab.
   • Select Hide all Microsoft services.
   • Select Disable all.
   • Restart Windows.
   • Test Taskmgr.exe again.
   • If Task Manager opens, re-enable services in groups to identify the conflicting software.
3. Since ucrtbase.dll appears in the crash, repair the Visual C++ Redistributables
   • Open appwiz.cpl.
   • For each installed Microsoft Visual C++ entry, select Change > Repair.
   • Restart and test again.
   • If needed, reinstall the supported x86 and x64 packages from the Microsoft Visual C++ Redistributable page referenced in the context answer.
4. If the issue started after a recent Windows update
   • Open Windows Recovery Environment.
   • Go to Troubleshoot > Advanced options > Uninstall Updates.
   • Uninstall the latest quality update.
   • If that does not help, use System Restore from Advanced options and select a restore point from before the issue began.
5. If Task Manager is disabled by policy or registry in the affected profile, verify again
   • Open gpedit.msc.
   • Go to User Configuration > Administrative Templates > System > Ctrl+Alt+Del Options.
   • Ensure Remove Task Manager is set to Disabled or Not Configured.
   • Run gpupdate /force.
   • Also verify these values are 0:
     • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr
     • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Group Policy Objects\LocalUser\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr
     • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system\DisableTaskMgr
   • Warning: editing the registry can cause serious problems. Back up first.

Given the symptoms, the highest-probability fixes are:

• deleting %LOCALAPPDATA%\Microsoft\Windows\TaskManager
• isolating third-party services with msconfig
• repairing Visual C++ components

References:

• task manager crashing because of "ucrtbase.dll" - Microsoft Q&A
• Task Manager not opening on my user account - Microsoft Q&A
• Task Manager crashing/freezing together with other apps such as Blender. - Microsoft Q&A
• Error message: Task Manager has been disabled by your administrator