Hello, first i tell you i can't speak englesh very well. I am from Argentina.
I have a problem with Slackware 10.2 instalation.
These are the steps:
1- boot with Slackware 10.2 CD 1
2- when i type de "setup" command i see: "No linux partition detected use fdisk o cfdisk bla bla bla". But this is imposible because i made the partition ext2 with Partition Magic on Windows XP.
I have two partitions /dev/sda1 (NTFS) and /dev/sda2 (ext2)
Why the linux setup no detect ext2 partition?
What is the problem?
What i must to do?
If anybody kown, please tell me the solution more easy possible.

I've tried Partition Magic in XP and then tried to install slack - didn't work for me either.

Try running fdisk, print the partition table, and delete/repartition the linux partitions (swap, and any other PARTS you want). Then write to the part table and continue with install.

Welcome to LQ! -- and to Slackware

Slackware Linux Basics would probably be good reading for you.
And Chapter 5. Installing Slackware Linux has some good guidelines.

I would recommend you use "cfdisk" rather than "fdisk" and use Linux tools for Linux filesystems. You can make a swap partition, home partition, and a root partition.

The main thing is never to use Windows-based tools to set up a linux system.