How to retrieve deleted fonts

Hey there Techyv readers,
I hope you can help me. I am trying to install one of my new downloaded fonts. I got loads of them because;I will need it in one of my typography projects. Unfortunately, after the installation, I accidentally deleted one of the fonts in the fonts’ folder.
It is very easy to download fonts and install them I know. But the problem is, I do not know exactly what font I have deleted.
Call me clumsy, but that was really an accident.
So, if you have got any ideas in mind on how do I get an unknown name font back, please let me know as every fonts matter to me because of my line of work. By the way, my laptop’s running on Vista.
Please send ways to resolve it related to Vista.
Thanks.
