Hello
how can I acquire data from the pc task manager in labview?
Probably learn how to translate .NET code into LabVIEW.
What information in particular are you looking for?
You can run a System Exec command with the command "cmd /c tasklist" to get a string containing the running processes.
acquire the data and be able to save a history of the task manager
In case you couldn't get what you want from the cmd tasklist or similar powershell Get-Process calls. If you are looking for something that tracks cpu usage you could take a look at this .net example and adjust it to fit your needs.