
Or download Service Pack standalone package and install it, takes about 1 hour. Go to Control Panel -> System and Maintenance -> Windows Update. See difference between Internal and Express mode. Installing Service Pack 1/2 for Vista/Windows 7 is recommended prior to installation on new language(s) in Express mode as they are not upgraded by SP installer unlike those languages installed in Internal mode. Right-click the Computer icon in Start menu and select Properties. Go to Control Panel -> System and Maintenance -> System.
First, check your system properties (32-bit/64-bit, Service Pack 1/2 installed or not):