How can I redownload apps I deleted outside of iTunes? When I stopped syncing my iPad to my PC I deleted the folder that had all my apps. Now I'm syncing again on a different hard drive, and I get the message 


  The app "X" could not be used because the original file could not be found. Would you like to locate it?


Of course I can't locate it, and there's no Download option that I see if I right click. These apps are missing their icons in iTunes as well, and I don't really know how this will affect syncing.

Is there some way I can redownload these apps back onto my machine? It's iTunes for Windows if that matters.
If iTunes in the Cloud is available in your country (it is in most), go to the iTunes Store,  click on "Purchased" in the right-hand navigation bar, select Apps at the top, and then click the download button next to any app you'd like to download.