Vista - Missing my country in language selection

Hello,

i have tried to install a difference keyboard layout onmy Vista Business.
The original one for Bulgarian Phonetic has some miss placed letters so I
prefer to use the old one.
I tried to install some different layouts form the internet to solve the
problem.
But after tyring which one is the correct and several install/uninstall
round i have found that my Country has dissaperared form the "Add input
Language" form tree view.
I couldn't find a way to fix this.
Unfortunately I have turned off system restore
Do u have any suggestions how to solve this problem without reinstalling my
vista?

Thanks in advance!