Hi, if you delete the other partitions on the harddrive you will have unused space on your harddrive. Install on C:\ you will be given the option to install over/ along side(I foegot the actual wording) OR a clean install. choose a CLEAN INSTALL
It will then be formatted, and a clean install will begin (if there is a problem it will tell you). you will need the product key, usually on the side of the P.C. case.
The other 2 partitions you can decide what to do after you have installed XP:
you can see whats in them in MY COMPUTER
Now a days P.C. manufacturers use a seperate partition to provide instructions and acopy of your pc if anuthing goes wrong.
you can use a partition manager to alter the size, delete or expand a partition
john