Hi
gryphon - big welcome to the forum.
It could be a few things - have you had any hard disk issues prior to this? Do you know if the disk was mounted/unmounted?
I always used the GParted LiveCD to partition my disk before doing the install and that way you can just point PCLinuxOS at the pre-set partitions during the install.
Oh, BTW, there is a later 2011.09 release of PCLinuxOS which will help you doing the first update (i.e. there won't be as many as with the 2011.06 release)
It can be downloaded from:
http://ftp.heanet.ie/pub/pclinuxos/live-cd/Post back for further help.