I have a 15GB partition wit Vista on it and I obviously have to extend it, however when I go to manage the drives and I right click the one I want to extend, the "extend volume" is grayed out (I can't click on it).
Diskpart gives me the error message saying: "Diskpart failed to extend the volume. Please make sure the volume is valid for extending."
PLEASE HELP ME

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CPU Athlon 64 X2 5400+ Black Edition |
Motherboard Biostar TForce 790Gx |
Memory 2280 MB DDR2 PC5300 |
Graphics Card EVGA GeForce 7300 GS |
Hard Drive 160GB WD Caviar |
Sound Card X-Fi Extreme Gamer |
Power Supply Ultra X-Finity 500W |
Case Apevia X-Cruiser Blue |
CPU cooling Xigmatek HDT-S1283 |
GPU cooling Stock fan |
OS Windows Vista Home Premium 32-bit |
Monitor Dell 15" LCD |