
Originally Posted by
eruptionjoojo
Actually as from the screen shot it is evident that it is your primary partition i.e. booting partition which you are trying to partition ...... thus somehow your OS is not opting for a larger size shrinkable volume greter than 310MB.
Thus in such a case you need to use some professional partitioners like Norton Partition magic,Paragon Partition Manager etc. for partitioning your hard drive rather than the Windows inbuilt partitioning options.
infact i would suggest you to wait for some more inputs from other members.