First download some hindi fonts available online widely. install them. select all fonts then press enter . t will get installed automatically or right click and install. now open pdf. copy the stuff you need. open word paste it. if still hindi not appearing then select all the words in word file. try change the fonts(while all matter still selected). hope it works.
Please share my guide to your friend. Here is the link to download Hindi Fonts in CAB formatted format. I am adding more fonts from different sources.