64Bit installation on a 500 GB Sata DRIVE

[Rod James Bio <rjubio@gmail.com>]

We've been doing an installation on this LTSP Server we are trying to
build. While formatting the 500 GB HD the partitioning
process is stock at 33%. Can anyone suggest if there are limitations or
problems or past experiences?

Anyway just for additional information:
I tried using lenny 64bit installer to no avail and 32bit installation 
is successful but we want to use 64bit because the machine has 5GB of 
memory so as to maximize the memory.
Processor is Intel QUAD Q9550.

--Rod James