Security Update for .NET Framework 4 on Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008, Windows Server 2008 R2 for x64-based Systems (KB2160841)- fails Tried fix recommended by Thomas_77 for same error installing SP1 update to VS2005 - didn't helpDavid Leland

Credits go to Control_tps Try the following steps, please: 1. Go to Program and Features, click it. 2. Scroll down to Microsoft.Net Framework 4 Client Profile, right click it. 3. It will give you a choice of Uninstall/Change, click it. 4. Then, it will give a choice to Repair it, pick Repair it. It will take about 4-10 minutes to repair (with my PC) your experience may vary. 5. When completed, go to your update center, and update it again. if this doesn't fix it, try to remove .Net Framework 4.0 with the .NET Framework Cleanup Tool (http://blogs.msdn.com/b/astebner/archive/2008/08/28/8904493.aspx ), reinstall it and install the Updates."A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

Thank You- Repairing the Client fixed the problem.David Leland

Problem solved! Thank's.

problem fixed thank you.

Thank You sooooooooo much!!

THIS WORKED!!! I AM IN AWE!!! Thank you computer master!!!!!!!!!!!!!!!!!!!!!

thanks a lot. i faced same problem and i fix my problem to follow your direction.

THANK YOU VERY MUCH!!! That frustrating problem has vanished! Thanks for making your instructions so simple to follow.

Worked like a charm!!

Many thanks for this procedure. It took several minutes to repair but the security update then installed and allowed a troubling situation to be resolved. Mike Butler

it works, you are amazing. thank you very much