[ALUG] Debian (Testing) Installation Issue

[samwise]

Hi,

After some good advice whilst on IRC (albeit cut short cos my windows
machine wouldn't stay up long enough to keep me logged in!), I've
decided to try to install the latest version of Debian "testing" on my
new HP laptop.  Given I'd prefer a KDE desktop, I've downloaded this
CD image:

http://cdimage.debian.org/cdimage/weekly-builds/i386/iso-cd/debian-testing-i386-kde-CD-1.iso

Which I think should let me install what I want.

Problem is, after installing most of the packages, the text-only
installer messes up.  The readable screen is replaced by funny
coloured blocks - I can see it's asking me a question and can tab
around the boxes on screen, but there's no way I can read any of it,
as all the characters have been replaced by blocks.

Soo ... I assume it's not playing nicely with my graphics card?  or something?

Any suggestions, on how I can get through the install?

TIA,

Peter.