I doubt you will be able to download software unless your computer is still under warranty, but it's a new service, so I'm not sure. Popup blockers will block the scanning for service tag. You must use Internet Explorer with popup blocker disabled to allow the scanner. It does not work with Firefox or other browsers. Edit--I just tried it and you must allow the installation of the utility. A yellow bar on the top of the window needs to be clicked and you must Allow the installation. You might have high security setting or other blockers that don't allow the installation.  I got thru and I am not supported either, so it is only for new users. I am still under warranty.
This is my first post, so apologies if this is not the best section for this question. I have XPS M140 system, for which I wanted to make a backup for factory installed softwares. My computer only came with XP CD. This is not about the regular driver downloads; this is about other factory installed softwares. I checked for similar questions, but the answers were incorrectly directed towards the drivers downloads. Ok, I will try to be more descriptive in my question. If you log into your dell account and then to "My account", there is a sections called "My Software". Under which there is an option for "Download Factory Installed Software (My Dell Downloads)". Clicking on it will lead to a page where it asks you to register your system.  When I click on "Register System" I get the error message "service tag not supported" or absolutely nothing happens. In fact not only in this place, anywhere within Dell If I try "Find my service tag" (using service tag scanning utility) it fails. If I manually enter, my service tag seem to be recognizable, I see all details about my computer. But for downloading Factory Installed Software I have go through that automatic service tag scan first, that's where I'm stuck. I have tried doing this in IE6 and IE8 with no success. I also have Microsoft .net 3.5 framework too . I have never changed any hardware in my 3+ yrs old laptop. I wonder if this service is only provided to new purchases? Somewhere I read only eligible system can download those, I am not even sure if my system is eligible or not. Forget the download part, I wonder why is that service tag scan failing to recognize my system?? Thanks !!  
Can't download factory installed softwares.