Lingvosoft provides Hindi translation software for Windows and PocketPC. You can download trial versions, to see what works best for you. The software packages fall into these basic categories:

• Hindi Talking Dictionary (just under $50). This is what most people are looking for. Load this on your machine, and you have a virtual translation device. It delivers instant bi-directional translation of all the words and phrases in its massive database.
  More info: PalmOS version | PocketPC version | Windows version
   

• Hindi Picture Dictionary for Pocket PC (just under $40). The Ectaco KwikPoint program is an effective and easy to use system for getting your ideas across–silently! Featuring more than 600 universally recognized symbols, it helps you communicate in many different situations without speaking a single word. It  lets you communicate your needs concerning dining, lodging, transportation, and other commonly encountered situations with a minimum of effort. Simply select the picture you want and show it to your waiter, hotel clerk, bus driver, or even your new best friend. Providing essential travel tools for your personal and professional needs, it allows you to interact with the people you meet on your trip abroad and to be understood! Make new friends and enhance your travel experiences now with this user-friendly communication tool for the whole family! More info
   

• Hindi Flashcards (just under $40). These make studying and foreign language as easy and enjoyable as it should be. Featuring 5 enjoyable games that make learning fun, they are the most effective way to memorize thousands of new words. Just install this program on your computer, and you can begin  developing your command of a second language in record time. The  customizable interface allows you to choose from numerous options to make the experience the most comfortable possible.
  More info: PocketPC version | Windows version
   

• Hindi Software Bundles (prices vary, depending on the bundle). A software bundle can provide significant cost-savings, if you need multiple languages or you want to combine the features of other offerings into a single economical package.
  More info: PocketPC versions | Windows versions