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Assuming you are using a Windows 7 DVD to carry out a clean install, I'd be inclined to delete all four partitions and create a new one for Windows.
You'll be able to do this during the installation procedure.
Windows will offer to create a 100 Mb System Reserved partition to hold the boot files, and then create a new partition for Windows.
This tutorial explains the correct procedure for a clean install.
Clean Install Windows 7