Mouse input not captured problem

Hi there,

I installed a vm of Windows 2003 in Hyper-V, it works well except the mouse cannot work. When I try to use mouse it pops up error msg and at the right bottom corner there are 3 icons, the middle one is mouse. If you move mouse over this icon it shows the msg: "Mouse input not captured" In virtaul server 2005 you need to install additions so I think something like that is required here. How can I solve this? Thanks in advance.

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allan