I have visual studio 2008 professional installed. I want to install SP1. When I try and install SP1 the following happens. MSI (s) (20:E4) [15:40:00:165]: Product: Microsoft Visual Studio 2008 Professional Edition - ENU - Update 'KB945140' could not be installed. Error code 1603. Additional information is available in the log file C:\Users\bjbell\AppData\Local\Temp\Microsoft Visual Studio 2008 SP1_20100609_151708728-Microsoft Visual Studio 2008 Professional Edition - ENU-MSP0.txt. My machine is running Windows 7 Enterprise 64bit.