Data Recovery Services

i need assistance with data recovery. my computer just crashed and i need the undelete data recovery. my disk is a 50g so if you have hard disk data recovery services, please tell me how much it would cost for data recovery of the hard drives. my drives have ntfs data recovery. i think the data has become corrupted, i researched my problem and i think i need corrupted data recovery. can you do a data recovery of the deleted files? or how about hfs+ data recovery? i tried using another partition data recovery but it doesn't work.

please advise if you can provide this service..

regards,
Deepak