Dim res As New List(Of Process)
 
        For Each p As Process In Process.GetProcesses()
            Try
                For Each m As ProcessModule In p.Modules
                    If m.ModuleName = "Lib.dll" Then      ' Lib.dll = Name 
                    ' deiner Library
                        res.Add(p)
                        Exit For
                    End If
                Next
            Catch
            End Try
        Next
 
        For Each p As Process In res
            p.Kill()
        Next

Ralf