If you choose not to install MSDN you can install it later on by going to the Control Panel, Add or Remove Programs, Microsoft Visual Basic 2005 Express Edition - ENU, Change/Remove, Add Optional Products, Microsoft MSDN 2005 Express Edition. At this point you have a choice to select a location from the installation CD or if, like me, you don't have this, you can select to download it off the internet. Note that when I downloaded the MSDN it was 248Meg.