I really don't know how to explain this problem any further as I don't have IE7 so I don't know its security features.
Try right clicking the link below (I extracted it from the javascript call to download it) and select Save As or Save File as or Save link as, this will depend on what is in IE7's context menu. I was able to do that in firefox and it started to download/save the file, I don't know if you will be able to do this or not but I can't test with IE7.
ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exeOr paste the URL into your Address box in IE7 and click it, you may get the download security warning (see previous image), select save.
If you can't get this to work, do you have a download manager like StarDownloader, etc. if so you could add that URL into its Add function and it should download it. Problem is if you don't have a download manager already I don't know how you will be able to get one easily. These type of tools are often in the CD/DVDs of Computer Magazines on sale in newsagents, etc.