Hey few days back i got some Korean phone and some Korean apps in this phone were iirritating me so i rooted my phone and delete them. While deleting i deleted system apps too like Contacts/ Phone. Now When i try to open contacts or phone log it crashes and says "unfortuantely it has stopped working". I went to system apps and tried to install again but it runs and finally says app not installed. Please tell me how to install again???