underscore

Hi,
I don't know if someone else has experienced it, but I have found today that
all my folders beginning by an underscore (_) (ex. _site) aren't accessible
in my desktop. They are still on my hard drive, and if I type all the path I
can access it, but I can't see the folders with underscore in it as well...

Since I've updated one of many Windows flaws lately, I was wondering if it
could be related to it. So, tell me if you have experienced it too, and if
you found a way to resolve it.

Thank you