hehe, you don't need a guru to help with stuff like that. New users can know just as much. We've just posted more since we've been on.
Partitioning can be done in two ways. Either by installing a partitioner which costs money, like partition magic, which will do it without re-installing windows.
On the other hand is the rather simple but also rather challenging option.
You have to format your drive first using the windows disc. Basically then, you are asked where you want to install windows (which will also create 1 partition on the drive. Every drive has 1 partition by the way, if it fills up all of it or not)
You then select to edit it (not sure on the key, but it says) and you half the full size available (i used a caluculator...) and then install it.
You'd then put the windows disc in again, and edit a new partition, using the other half of the drive.
The only problem doing it this way though is that you end up with two windows setups, though you could then format that partition that you don't want windows on within windows on the one you do want, to clear it.
This is done by right clicking My computer, and going to Manage. Then go to the disk management tab.
You can then select the partiton (would have become D) and right click it and select format.
You'd then have one windows setup, and two partitions
The only problem is that you have to backup all your data doing it that way, and then format to get it to work, since the original would have used all the drive.
I hope this helps