The sad thing is that I was actually needing to use IE5 in February. A Windows 2000 Server machine in India which had been unused for a few years but was being pressed back into service. And Windows Update seemed to need IE6 to be able to install IE6. With a separately-sourced IE6 installer, I did finally get it up to IE6, but I couldn't manage to get it up to IE6 SP1 even then. IE5 was certainly rather painful to us…
http://www.microsoft.com/en-ca/download/details.aspx?id=1
Of course do be warned that you are using unsupported software that had not received security updates since July 2010.