Blue icon for C Drive

I hope you can help me---I hope I can explain this kooky
little thing that just happened. When I hit My Computer &
it pops up the different drives (A, D, whatever)the text
underneath the little icons for the drives has always
been black. All of a sudden, the letters identifying the
C Drive are all in blue & underlined (like they are when
you can click on a link for something)
So my question is "Why?". Why all of a sudden am I
getting the blue?

Thanks so much!
Whitley