How To partitioning Notebook Toshiba

To divide partisi on notebook toshiba with Windows Vista, I have once struck a snag severally last time. I try to use powerquest partition magic's program, apparently programs not it clears a root at vista's windows then I try on partisi windows Vista deliverance which is from control panel---> administrative tool---> computer management--> Disk management. but we can't divide partisi appropriate our the will. Since size prescriptive windows partisi that we wants. After tries a long moment, I found Paragon Partition Manager program. This program working at windows vista, but there is umpteen constraint, for notebook toshiba type new type that have hardisk upon 160gb, this program on the contrary doesn't recognize hardisk, alias declares for hardisk invalid.

1. I reduce before measure hardisk at drive c divides it use control panel---> administrative tool---> computer management--> disk management. After successful hardisk split up becomes two partisi then followed by second stages.
2. I open paragon parttion manager program, apparently hardisk can be recognized, stage easy become. We can divide partisi hardisk appropriate our wish