I'm running a Windows 8.0 which came installed on my Dell laptop as i bought it.
There's plenty of mp3 albums on my hard-drive (a sole hard-drive with just one partition for everything). I keep them all in the My Music folder, and shuffle them frequently: change names of folders, move folders around, delete them — all that with the windows' own explorer program. I only use Winamp to play them back. And of course, i terminate Winamp before i need to do anything with folders.
Every now and then, some of those actions are blocked, as if something keeps accessing those files. This is what the Explorer tells. At any time, up to 30% of folders is blocked that way, and which is more curious, is that this blockage is shifting. Like, i need to move a number of folders, and one of them gets stuck because it's 'blocked', so i proceed with the next one, and it works, then i come back to the previous one, and this one works now too.
What is going on there in the background? I did turn off the automatic defragmentation.
I don't have no anti-virus, nor any other application that could involuntary access random files on my computer.