My PC configuration is as follows:
CPU: AMD Athlon II 245 X2
RAM: 2GB DDR2
MB: ASUS M2A74-AM
SATA DVD-Writer
WD 320GB SATA HDD.

SATA Controller is in AHCI mode in BIOS.

Partition Table:

1. Pri. (Windows 7 Ultimate)
2. Log. (Data)
3. Log. 15GB free space (want to install Linux in this partition)

I want to install Debian 5.0.4 from DVD. But the installer is not showing any partitions, it says entire hard disk is blank. But I ran 'fdisk -l' in the console, it shows the partitions correctly. Please help installing Debian.