Why can not Safely Remove Hardware

Why can not the computer prompts Safely Remove Hardware “this operation because of this computer's settings have been canceled, please contact your system administrator” who help out the errant attention to the boy in this first I would like to thank the

rights issue may be that you have the hardware to run the software.or procedures for doing so.documents.running.in the process of the computer's disk U still in the process Running, open the Task Manager to turn off the process will be able to have such a situation should be the system does not release memory End, you rundll32 to the end of the process, there is the possibility of the virus is in the U disk, to test things, you'll download a U disk by the name of the virus scanning software specifically to kill you on the line.It is inserted into the mobile U disk or hard disk can not be after the Safely Remove Hardware?!
if you do not have to worry that I have encountered similar problems
1, antivirus
2, to determine U mobile hard disk or the end of the process, all included in the writing process with all
2, not to kill Reinstall it on the system, not a! ! Write-off of a bomb again.Not directly out of the good.