Hard Disc Partitions

I have a DELL and I have re-loaded XP Professional, the C (NTFS),D and E
(NTFS)drives set themselves up. When I turn the machine on, it boots from 'C'
drive which has the XP Operating system and is sized at 2 gig. 'D' drive is
the DVD and 'E' drive which has 35.25 gig sits there and does nothing. A 2
gig 'C' drive is too small to add all the necessary software; how do I
combine or switch C and E or how can I turn E into C...how do I rename and
change the file paths to use E as the boot disc partition? I am aware that C
and E are partitions on the Hard Drive: without reformating or reloading xp,
how can I get more work space?
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Thanx for the help