[SOLVED] k810i phonebook corrupted

hey guys, i've a very big problem to solve as soon as possible. my phone hangs wile trying to open my phone book and everything in the recent call list has no name(only the numbers). i think i've deleted something which is very important while modding my phone k810i. in the root of the filesystem explorer, i found a folder named "card" which i never saw n i delete it without thinking further. but now, my phone restart by itself whenever i tried to open my phonebook. i've backup my GDFS. will it help restoring my gdfs? please help me. anyone???