Task manager blocked due to a virus

By mistake, I tried to install some file on my pc and now, my Task manager gets blocked every time I try to access it. I also deleted the file, and restarted the PC, but my Task manager is still blocked. After doing a Malwarebytes scan, nothing changed nor has it found anything interesting. Any help is welcomed.

I will help you to re-enable the Windows Task Manager as long as it cannot open normally. Just follow these steps.
Disabling Task Manager is one way viruses try to make it harder for us to deal with their infections. Before proceeding any further, you should run a complete and up-to-date anti-virus scan of your machine.
& Try to remove the virus else it will again disable your Task Manager.
Open Group Editor Policy by Clicking on Start, then click Run and type in gpedit.msc and press OK.
Once in the Group Policy Editor, expand in turn:
User Configuration
Administrative Templates
System
Ctrl+Alt+Del Options
On clicking Ctrl+Alt+Del You will have four option on right hand side.
Double click on Remove Task Manager to change its setting:
Click on Not Configured and then OK and Task Manager is available once again.

Hello @Fisher998

It may be a problem of group policy and it may be virus also
As you told that you have scaned your commputer but the problem is still there
Option 1. you update your anti virus and the scan your computer again.
Option 2. check the link that is shared by microsoft support team to solve the problem.Task Manager can't be opened - Windows Server | Microsoft Learn

Hey there!
Follow the steps in this link