Here is two ways to do it in VB.
CODE
Process.Start("C:\WINDOWS\system32\taskmgr.exe")
Dim DTMGR As Integer = FindWindow(vbNullString, "Windows Task Manager")
SetWindowPos(DTMGR, 0, 0, 0, 0, 0, &H80)
CODE
Dim Pinfo As New System.Diagnostics.ProcessStartInfo("C:\WINDOWS\system32\taskmgr.exe")
Pinfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden
System.Diagnostics.Process.Start(Pinfo)
and to turn it off
CODE
Dim CTMGR As Integer = FindWindow(vbNullString, "Windows Task Manager")
SendMessage(CTMGR, WM_CLOSE, 0&, 0&)
A "work around", I know. But it does the job. Of course you have to Declare the windows API's first.