Farsi (Persian) keyboard layout

In Windows XP and Vista KBDFA.DLL has got wrong keyboard layout and should be replaced by the version 5.0.2180.1. There is a problem in Windows XP with the Persian keyboard layout at the very start and it was never fixed. At that time, I always had to restart in safe mode and replace the corresponding file (KBDFA.DLL) with another correct version manually. Now, I am facing the same issue in Vista and this time I am not able to find a way to replace that Dll file using the same method. I also tried to login in safe mode as an admin, but I still dont have the access to do that. Actually, I am looking for a way to replace such DLL files manually in Windows Vista. Any suggestions?

Using Microsoft Keyboard Layout Creator (MSKLC) you can change the VISTA's default keyboard layout. I have done it and I create an installation package.

Instructions:

1- Download attached rar file and extract it.
2- Install the modified layout (Run setup.exe file)
3- Your new layout is ready.

I did not know that Vista has support for Farsi keyboard? Can some one please guide me to install farsi keyboard on Vista?
Thanks.
Translator

All right you can install this by visiting your control panel the R and language option K and languages change keyboards>general>add>farsi