installig Linux along with windows 7 - partition issue

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http://www.linuxquestions.org – Hi I am having a windows 7 system with ntfs file partition. I wanted to install Red Hat Linux without removing Windows, when it prompted me to select type of installation, whatever option I select it is not allowing me to proceed 1. Selected the option - Replace Existing Linux systems Error - Could not find enough free space for automatic partitioning, please use another partitioning method 2. Selected the option - Shrink Current system Error - No partitions are available to resize, only physical partitions with specific file systems can be resized. 3. Selected the option Use Free Space (HowTos)