I have recently added a 250gb external hard drive to my computer to try to improve its speed. I transferred all my photos and music (except the itunes music) with hope that this would make the computer run faster. The problem is that since i did this the computer is running slower then ever and is giving me a lot of error messages (mostly when i am trying to use the net, it will tell me that the program has encountered an error and needs to close) When i put the hard drive on it was supposed to automatically install the software required but it didnt. When i tried to find the software to install i somehow installed two programs - Picasa and google desktop. What have i doen wrong and how can i get mu computer up and running at it best speed???