valerie,

If the FTP Log On As window does not automatically display or you get an
error, go to File >Login As to open the FTP login prompt.

Did you also "upgrade" to IE7 from IE6? If so that might be the problem.
From what I have read MSFT has changed IE7 such that it doesn't support FTP
as it did in IE6. I am still trying to understand the details and develop
workarounds.

If you are indeed using FTP uploading protocol, then I would suggest that
for the short term at least, I would download and use FileZilla, a free FTP
client for uploading your site. http://filezilla.sourceforge.net/  Its
actually a better way than using IE in my opinion. Download the excellent
instructions from the FileZilla site too.

If you are using HTTP, or made any other changes in your computer, or
switching to FileZilla doesn't do the trick, post back and we will try
something else.

DavidF