Since installing NIS2011 I seem to be suffering random system lock-ups. These are caused when I try to move files from one directory to another in Windows 7 64 bit. I start two explorer windows in appropriate places and then right click drag and select move at this point the move dialogue progress bar window pops up and from that point on I can no longer use the system. Windows will not close, programs will not start, processes cannot be killed in task manager and to top it all I cannot even shutdown the system I have to resort to the reset button. The installation of NIS 2011 is the only major change that has happened to the system Any ideas on how to locate/prove/resolve the issue appreciated. Unfortunately I cannot produce the issue on demand but it is happening once or twice a day with no obvious sequence. It has even happened once after starting up logging on and trying to move files as the first thing I do, so its not even starting other programs or having them running.