MsgBox that shows computer not found instead of Nast VB system.exception window

I have code here to kill a process on a remote machine.  If I put in a node name that doesn't exist, it throws a nast vb system.execption error, how can I make so that a simple Msgbox shows that just simply says computer not found or destination host cannot be contacted, or even access denied if the program is being run without the proper permissions.

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim objWMIService, objProcess, colProcess, objProgram
        Dim strComputer, strProcessKill, strInput, strexe, strShell

        strProcessKill = "''"

        If (Trim(Me.Pcname.Text) = "") Then
            Call MsgBox("Please, Type a Host Name or IP.", MsgBoxStyle.Exclamation, Application.ProductName)
            Exit Sub
        End If

        ' Input Box to get name of machine to run the process
        Do
            strComputer = Pcname.Text
            If strComputer <> "" Then
                strInput = True
            End If
        Loop Until strInput = True

        objWMIService = GetObject("winmgmts:" _
        & "{impersonationLevel=impersonate}!\\" _
        & strComputer & "\root\cimv2")

        colProcess = objWMIService.ExecQuery _
("Select * from Win32_Process Where Name = " & strProcessKill)
        For Each objProcess In colProcess
            objProcess.Terminate()
        Next
        TextBox1.Text = (" Just killed process " & strProcessKill _
        & " on " & strComputer)

    End Sub