Linux Installationon Windows Dual Boot

[aitai]

Hi, All

I am creating a multi-boot development environment, and stalled at the Linux Redhat 7.0 step. Right after I choose the custom installation option, I get the following error: 'An error occurred-No valid devices were found on which to create new file systems. Please check your hardware for any errors.'

Included below is the current layout. Thanks in advance for any insight-much appreciated!.

Current Environment;
-Primary Master (C: drive, Primary Partition, Active, FAT32, 6.8 GB) [ WIN98 SE, 6.8 GB ]
-Primary Slave (D: drive, Primary Partition, Not Active, FAT32, 14.3 GB)[ WIN2K, 5.98 GB ]
-Primary Slave (G: drive, Extended Logical Partition, Not Active, 8.29 GB)[ Empty, 3.0 GB ]
-Primary Slave (G: drive, Extended Logical Partition, Not Active, 8.29 GB)[ Unallocated, 5.3 GB ] intended for PM formatting and Linux installation.