You can have problems getting downloading to work smoothly with IE7. The blocking behaviour of IE7 against downloads can be modified through Tools --> Internet Options --> Security.

There is also a problem with the automatic startup of downloads in IE7. This is because of a block put on automatic JavaScript running when a window loads. You can remove the block by enabling the security option "Allow websites to prompt for information using scripted windows" which is near the end of the list in Tools --> Internet Options --> Security.