Win32/Win64 API DeviceIoControl failed.

My school is using Backup Exec System Recovery 2010 at Windows Server 2008, it can't any backup from last week. I tried reboot the Windows Server, but it still doesn't work! This moring is show up an error message: Win32/Win64 API DeviceIoControl (IOCTL_VSNAP_MAKE_READONLY) failed.

I don't know how to solve it, please anyone has any solution to solve it.

Thanks,

Danmak