Unable to extend volume

hello,
I want to use that 4.88 GB and allocate it into any of the 4 drives... but the extend volume option is grey and i cannot select it.. since the unallocated space is at the right of all drives i should be able to use it, right? plz help me out...

you will have to delete the unallocated partition to turn it in to free space and 4 partitions on a drive is rule of thumb just checking for you

http://www.addictivetips.com/windows-tips/extend-or-expand-volume-of-windows-partition-in-vista/