Windows Sharepoint Services 3.0 - Cannot open any documents in sites

When you use Sharepoint you can no longer access any documents in the site, they links are available but a 404 error is displayed when trying to open the document.

Event ID 5586

When this issue occurs check the application log and if you have the event 5586 WIndows SharePoint Services then check to see if this update has been installed by WSUS or your patch management application.

http://support.microsoft.com/kb/934525

If this update has been installed you will need to re run the Sharepoint Products and Technologies Configuration Wizard on your SharePoint Server.

Run the wizard

Once this has completed this will update the patch fully and restore your SharePoint WSS 3 to a working system again.