A friend told me that Microsoft issued an XP version that works on USB. It's minified and already has a browser included.  

In fact I doubted that!, Because he told me that it was Free of Charge and that just doesn't make sense to me.
Anyway that's why I came to ask you guys.

The reason I badly want that, is to use it to test my website cross-browsers. I know it's a good Idea to buy a Windows License and install it on a Virtual Machine (like VirtualBox) but I feel like I don't have to buy a full license just to open a browser!

**Notes:**
 
  - I'm using Ubuntu 9.04 as my desktop at the work, it's cool with me but because theres is no IE7, IE8 on it! And all the clients wants a cross-browser compatibility.
  - I tried to install [these Images][1] on my VirtualBox, but it just didn't work saying "Hardware changed, ... re-activate this version again. Any idea to make this work under VirtualBox/Ubuntu it's highly appreciated.


  [1]: http://www.microsoft.com/downloads/details.aspx?FamilyID=21eabb90-958f-4b64-b5f1-73d0a413c8ef&displaylang=en