Disk Partitioning on Windows XP

Hi,

I have a dell laptop which has only 1 partition - c:\
All my data is on C: (as there is no other drive).

For security of data against disk failures, I want to create another drive (D or E), which will be different from my system drive and I will use it to keep all my data there.

Can I please get a step-by-step process for doing this partitioning, without loosing any of the present data on C:
(steps right from backing up the present data, then partitioning, creating a new drive and finally moving all the C: data to the new drive)

Thanks,