I have installed SQL Server 2005 Reporting Services on Windows XP Pro
SP2.

I've accessed the Reporting Services page via Iexplorer and all seems
well. When I click on Report Builder the process starts to verify then
download the application, but after about 40% I get the error 'Unable
to retrieve application files. Files corrupt in deployment'.

Can anyone suggest how to get around this?

I've searched microsft and found an article relating, but there is no
suggested fix for this particular error.