I extended the maximum size of my Windows XP virtual hard drive from 20 GB to 25 GB, but then it said that I also have to extend the partition from within the guest OS. I logged on to my Windows XP virtual hard drive and went into Disk Management. When I try to right-click on the primary partition, I don't see an option to extend the partition. Can someone please tell me how to extend it? My searches on Google have yielded nothing of use.
Here's a screenshot of what I'm doing by the way:

Here's a screenshot of what I'm doing by the way:

My Computer
At a glance
Windows 7 Home Premium x64Intel Core i5-2410M Quad Core CPU @ 2.30 GHz8 GB Shared Channel DDR3 MemoryIntel HD Graphics 3000, AMD Radeon HD 6470M
- Computer Manufacturer/Model Number
- Dell Inspiron 14R N4110
- OS
- Windows 7 Home Premium x64
- CPU
- Intel Core i5-2410M Quad Core CPU @ 2.30 GHz
- Memory
- 8 GB Shared Channel DDR3 Memory
- Graphics Card(s)
- Intel HD Graphics 3000, AMD Radeon HD 6470M
- Sound Card
- Intel Display Audio, Realtek High Definition Audio
- Monitor(s) Displays
- 14" HD 720p LED Display
- Screen Resolution
- 1366x768
- Hard Drives
- 500 GB 5400 RPM SATA Hard Drive
- Mouse
- Microsoft USB IntelliMouse Explorer 3.0