Yes there is.
There are a number of programs avaliable. I will run through Partition Magic 8 as that is what I know. Actually I was using it this morning to split a drive in two.
Install and run.
Hit the "Make New Partition" button on the left hand side.
Choose which drive you want to split. You will only have one. hit next.
Here you can shoose where to put your new drive. I suggest "After". This should come up as teh reccommended options. Hit next.
now you can choose the size for the new drive. If you want to drive the sme size then you will need to enter 80000 here. It may change slightly. Next give your new drive a name. Something like sparedisk, seconddrive, etc... Leave the other two settings on reccommended. Hit next.
It will then come up and show you what you have donw and what your new disk will look like. Hit finish.
Nothing has been donw yet. You have simply set the options you want to change. To actually do your changes hit the "Apply" button in th ebottom left corner. This will start the process. SOme warning may come up. Read them and hit yes to continue.
That should do it. The program will reboot the computer into dos and do the changes. It will then reboot back into windows with all of the changes done.
Hope this helps.