Felt I had to add my tuppence worth here.
Partition programs are great as long as you have an HDD that is absolutely gauranteed not to fail, how many out there can give that gaurantee. If the HDD fails then all partitions are gone, not pretty. (remembers back to last year and a batch of fujitsu 20Gb disks - still can hear customers shouting at me cause it all went bad - still swapping flaky disks out with my suppliers)
If it is XP you are installing use your fastest disk as your primary boot device, then store apps, docs, mp3's etc on a separate drive and spend 10 minutes a week/day (whatever frequency suits you) doing a backup of important info then you will have a trouble free computing life. Personally I ghost my disk onto removable disk then hide it away safe.
2p well spent...