A client with 7200 employees in 14 cities (all connected via high speed WAN connections)...

A client with 7200 employees in 14 cities (all connected via high speed WAN connections) has suffered a major external security breach via a desktop which cost them more than SI 72.000 and the loss of a high profile client. They ask you to perform a desktop vulnerability assessment to identify everything that needs to be patched. Using Nessus you find tens of thousands of vulnerabilities that need to be patched. In the report you find workstations running several Windows OS versions and service pack levels, anti-virus software from multiple vendors several major browser versions and different versions of Acrobat Reader. Which of the following recommendations should you provide with the report?