On starting my computer this morning I have noticed the CPU cooling fans running a little harder than I'm used to hearing when just using Firefox. On looking at the task manager I have noticed that rather than sitting at the normal 0% CPU usage when idle a process labelled NTVDM.exe is sitting at a constant unmoving 25% CPU usage. A quick Google says it is an essential service and should not be terminated. But I have to confess I have never noticed it before and as already stated my processor usage normally sits at 0-5% when idle. Any ideas please. I am deeply suspicious of this process despite what I see on the Googling.