Im trying to run javaloader to wipe out my 7520 but its not working or I dont know what im doing. Does javaloader have to be run in Dos? How do I run Dos with XP? Im trying to follow these directions to reinstall my OS

Should this method fail, you will have to download the file javaloader.exe from the internet. Place it in a common directory (I usually put mine in the Loader Files directory for easy access. From the directory you have javaloader.exe installed in type "javaloader -usb wipe". This will completely erase all data and applications from your devie. Now navigate to C:\Program Files\Common Files\Research in Motion\AppLoader and delete the file vendor.xml. Now plug in your device and install the new OS from scratch. Open apploader and select the USB port as your connection. It will then bring to you to the main apploader screen and all the OS packages will be listed with status as Install.

Yup, Javaloader is a DOS command,

To open a DOS prompt, click on the Start button and the run, type cmd and press the OK button. A DOS command prompt window will appear. You have to move to the directory where you have Javaloader. For example, say it is in C:\blackberry\games

You type
cd \blackberry\games and press the enter key

Now type javaloader -usb wipe

That should work.

Good luck!