I downloaded the free SDK from nokia's site, but failed to install it on my Windows XP computer.
If I choose to have the binaries/SDK installed in addition to the libraries and examples, I get the following error during setup, and the setup program just aborts!
Component transfer error
Component: symbian libraries
file group: binaries
file: <shared tools>error: the filename, directory name, or volume label syntax is incorrect
People make it work under xp(probably you need admin rights), and I work with it under Win2K. However when you download it state, that Win NT, is a requirement therefore no official support or correction packages for Xp exsist. Search for 'XP', and you will find some posting and people who may able to help you.