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In windows XP go to the control panel and find the icon for add/remove programs double click it, go through the list that pops up and uninstall all java 6 versions you see, you should be left with just one JAVA 7 entry.
Please take your FTB folder out of the location that it is in. Place it in a new (empty) folder on your desktop, with *no spaces* or *special characters* in the file path. It cannot be placed in any folders containing other files/programs or in any temporary folders, including Downloads. It needs to be placed in a folder, and cannot be placed directly on your desktop. Change the install directory (in the options tab of the launcher) to the new location.