We are required by an application upgrade to update the Oracle client on all computers to version 11g R2 (22.214.171.124). Currently our PC's are running different versions of the Oracle client - 9.2, 10.1, 10.2, & 11.1. The larger majority are 9.2 & 10.2. I understand we need to do a complete removal of the old client and then install the new one. How can we best automate this process? Our computers are spread across a large number of sites.Ideally we would like to do one site (50 -100 computers) at a time. All computers are running Windows XP or 7.