You are hereFixing Windows Update Failure - Error Code 0x643

Fixing Windows Update Failure - Error Code 0x643

By hagrin - Posted on 04 August 2008

Today, as I was patching my machine, I noticed that I still had not installed the Visual Studio 2005 Service Pack 1 on my work development machine (a Windows Server 2003 R2 box). I loaded up Windows Update, selected the VS 2005 SP1 checkbox, let the update download and chose to install. After what seemed like 10 minutes of hanging and nothingness, the update installation failed. Huh? I went to "Review Your Update History" and clicked on the question mark next to the failure icon and the resulting pop-up simply stated Error Code: 0x643 and with 3 very useless links to find out more information.

To save everyone time, the fix can be found here and this link will ask you to download a patch that fixes the insufficient contiguous virtual memory problem that prevents you from installing certain .msi or .msp files. Run the executable after it has finished downloading and then return to Windows Update to finish patching your software. Good luck!