netlogoHave seen this on a couple of Windows XP systems – .Net 2.0 Security update KB2804577 will successfully install, but then it is flagged to be installed again. And again. And again.

Weeding through a variety of MS support forum posts, I finally found the answer at the bottom of a thread that mainly contained ‘THIS IS THE WRONG FORUM’ replies. SMH. Thankfully someone answered the question:

GMazeika replied on May 17, 2013

Check file C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Security.dll

In XP version of file must be 2.0.50727.3646. My old file had version 2.0.50727.3644.

Replace System.Security.dll with version 2.0.50727.3646 and restart Automatic Updates service.

Sure enough – grabbed the right version from another Windows XP box and the update stopped requesting to be installed. Scary that the top answer to that thread is ‘just hide it’ when it’s a security patch.