DISABLE IE'S DOWNLOADING CAPABILITY
Do you support Windows XP users who insist on downloading files from the Web via Internet Explorer--regardless of what you tell them? If so, you'll be glad to know that you can disable Internet Explorer's ability to download files by tweaking the Security settings.
IE's downloading capability, follow these steps:
4. Scroll through the Settings list box, and locate the Downloads heading.
File Download, select the Disable radio button.