I have a problem

Perhaps slightly off topic but I don't know who to ask!

I recently downloaded some fonts.... well, yesterday or the day before
I have a large font gallery really, but when I go to install them it says "font folder busy right now, try again later - do you want to retry now or cancel?" so i press retry and it comes up again. I press cancel, then when I go to shut the window it takes ages before saying it's not responsing and to "End Now".
It's driving me crazy!! I don't get why the hell it's "busy" !!
Can anyone help??
thanks. I managed to only download one font which was "Migraine" or something, and even that went a little strangely.
Any help much appreciated