Is it possible to create a RAID 5 volume in disk management in Windows 7 Professional??? If not normally, can I add something to this OS that will allow me to create a RAID-5 volume???

Hi, it is not possible. For Windows XP is a hack, but for Windows Vista and Windows 7 is nothing. And software raid5 is VERY slow > processor must compute all XOR data (you will see it on writing..:)...HW based raid is much better. www.windowsreference.com/windows-xp/how-to-add-software-raid-5-support-for-windows-xp/If you want software RAID5 you must use Windows Server editions...