Re-installing Windows Update Agent (WUA)
Whilst troubleshooting Automatic Update Client, sometimes you might want to re-install Windows Update Agent (WUA). But, if Windows Update AutoUpdate Engine is already updated to version 5.8.0.2469 then, you will see the following message;
"Install is not needed since windows update agent is already installed."
To force the install, download WindowsUpdateAgent20-x86.exe and run the following command;
"WindowsUpdateAgent20-x86.exe /wuforce"
- To install WindowsUpdateAgent20-x86.exe silently run the following command; "WindowsUpdateAgent20-x86.exe /wuforce /quiet"
- To install WindowsUpdateAgent20-x86.exe silently without restart, run the following command; "WindowsUpdateAgent20-x86.exe /wuforce /quiet /norestart"
MORE INFORMATION
For x86-based computers (WindowsUpdateAgent20-x86.exe)
http://go.microsoft.com/fwlink/?LinkId=43264
For x64-based computers (WindowsUpdateAgent20-x64.exe)
http://go.microsoft.com/fwlink/?LinkId=43265
VBScript to check if the new AU Client (WUA) is needed and installing it accordingly
http://msmvps.com/blogs/athif/archive/2006/05/17/95463.aspx
Automatic Update Client Versions History
http://msmvps.com/blogs/athif/archive/2005/06/15/Automatic_Update_Client_Versions_History.aspx