You already have four primary partitions, thus you could not create more partition unless you convert one of the primary partition to logical partition, I think you may know this limitation of ms MBR disk. In windows7 when you encounter this problem it will convert to dynamic disk, but I dont recommend as you may know "invalid dynamic disk", or some day you may encounter problem to convert it back to basic disk without data loss.
Here in your situation I recommend convert "HP tool" partition to logical, but you may concern that “HP tool" could only work under primary status. However this partition is not often used, once you needed you could convert it back to primary. For win7 you could use freeware Partition Assistant home edition. Here is the tutorial convert primary partition to logical without data loss: http://www.***/help/convert-primary-to-logical.html
Sir I followed what you have said but my concern is how can i set it back to primary partition from logical when i will need it.