Partition Magic 7.0

[srbconstruction]

Hi All,
When I built my computer I partitioned my drive
with partition magic 7.0.
I am running XP OS and it gobbles a great deal of space
on the c: partition. which is 2,047.3 the largest size allowed when I first did the partition.
I made partitions A-Z for filing purpose.
I added an extended partition of size 24,152.5 to C:,
but it does not seem to be doing anything
the problem is ; I keep getting a low disk space msg from Xp
and I am only utilizing 1,403.5 of partition c:.
Is there any way to make c: Bigger?
Or merge the extended partition into C; primary
(I should mention that the extended partition is also primary)
Thanks in advance
Steve