Desktop Pool by creating an Automated Pool model, desktop Pool add success, and adds the virtual machine below:

But to login error, error is: the current desktop is not available, please try to connect again later, or contact your system administrator,

What reason is this? Template using a Windows 7 32-bit system
I also created a template is xp 32 bit desktop pools, creating a successful, after the listing of the list of the virtual machine state is available, but the login when the virtual machine, the user can log in, but no mouse is black screen, waited a while to disconnect, what reason is this?
Pray god can help me to solve these two problems,