It is an annoying thing if you want to remotely access your virtual machine which is located in a windows server 2008 Hyper-v platform, and you get surprised when you see the following error message which telling that the mouse is not captured even though the integration services already have been installed.
well, the solution was by enabling the HAL (Hardware Abstraction Layer), which can be done by going to start > Run > msconfig > Boot
> Advanced options
> Check Detect HAL
> Then you will be prompted to restart your machine
After restart the mouse is working