A 
system and method update 
client computers of various end users with 
software updates for 
software products installed on the 
client computers, the 
software products manufacturered by diverse, unrelated software vendors. The 
system includes a 
service provider computer 
system, a number of 
client computers and 
software vendor computer systems communicating on a common network. The 
service provider computer system stores in an update 
database information about the software updates of the diverse software vendors, identifying the software products for which software updates are available, their location on the network at the various 
software vendor computer systems, information for identifying in the client computers the software products stored thereon, and information for determining for such products, which have software updates available. Users of the client computers connect to the 
service provider computer and obtain a current version of portions of the 
database. The client computer determines that software products stored thereon, and using this information, determines from the 
database, which products have updates available, based on product name and release information for the installed products. The user selects updates for installation. The selected updates are downloaded from the 
software vendor computer systems and installed on the client computer. 
Payment for the 
software update and the service is mediated by the service provider computer. 
Authentication of the user ensures only registered users obtain software updates. 
Authentication of the software updates ensures that the software updates are 
virus free and uncorrupted. Changes to the client computer during installation are monitored and archived, allowing the updates to be subsequently removed by the user.