Web interface failed after update

I recently updated an existing UberSVN installation using the web browser (IE 9) I successfully updated the core for both 1.6 and 1.7, but when I updated Apache Tomcat the web browser shut down and when I try to connect I get the following error.

HTTP Status 404 -

type Status report

message
description The requested resource () is not available.

Apache Tomcat/6.0.35


I am sorry I don't know the exact version that I updated from because I can't get in to check. It was a fairly recent update. SVN is still running so I can administer from the command line, but I would like to get the browser back. I am reluctant to disrupt my users by doing a hotcopy and reinstall just to fix the web interface.

I am running on a Windows 7 64 bit machine.

Thanks.

admin4good