My hard drive has mysteriously renamed itself

The hard drive item that sits permanently on my desktop has been renamed to 'pe. I noticed this yesterday evening, after I'd downloaded some software updates and tried to back up my files using Time Machine.
An image file that was saved on my desktop has also changed its name, from "Peter and Laura caricature" to "-09§". However, the name of a movie file saved on my desktop has remained the same, so whatever has caused these file names to change hasn't affected everything on my desktop (I only had three items there - the hard drive, the image and the movie).
Is this something I need to be concerned about? Does it signal some sort of corruption or virus? No-one else uses my machine.
I'd be very grateful if anyone out there could help me with this.
Best regards
Daniel

Hello db:
I am not going to turn this into a discussion about AV software. However, it is, IMHO, a complete waste of money and system resources to install AV software on a Mac running OS X. If one uses "reasonable" intelligence about downloads, there is minimal/no risk.
I wonder why a business would permit downloading music..... must be a very different business from ones I managed IT for in my previous life.
Barry

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