Installing easys 4.2

[_HG_]

I have a 400GB hard disk in my computer.
I choose manual partitioning.
2GB Swap (partition #2) and the rest of the disk space Ext3 (partition
#1).
After partitioning is completed, it is not possible to proceed because
the "NEXT" button is shaded (not active).
If I go back and choose automatic partitioning, the installer makes a
third partition of 15GB in size and then install the system on that
15GB partition.
Weird !!!