HOTFIX: On a windows 2003 server SP1 based computer, IE6 may crash when you click a link on a web site to download a file
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.
http://support.microsoft.com/default.aspx/kb/920853