[wubi] Trying to Disk Partition but.................(VISTA)

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http://ubuntuforums.org – WINDOW VISTA 32-BIT hp Pavilion Entertainment PC dv3 i am having trouble splitting my hard drive to the space that i want. (Partition so i can dual-boot Linux Ubuntu) when i right click my C: drive to see how much space i have and used up: USED:76.3 GB FREE SPACE: 209 GB with total capacity 285 GB when i go to start>right click computer>manage>storage>disk management and try to shrink my volume for C: the max i can go total size before shrink in MB: 292784 size of available shrink space in MB: 14856 total size after shrink in MB: 277928 why is that?? is there anyway (Hardware)