You have a number of things to do, in addition to restoring your files.
You need to figure out why these files, if they were needed, were stored in a "temp" folder, which as Mischcabob notes are temporary - that is, designed to be deleted on some regular basis.
You need to figure out a storage plan for your files that makes sense to you, establish the folders where you will keep your files, and tell your software where to store your files. As when downloading a file, selecting a different folder than "temp" if that is what is suggested to you. And do not use the Desktop, or "My Documents" for this. Though My Documents can serve as an emergency container until you sort things out and get them into your permanent storage folders.
To better understand restoring deleted files you might read this:
http://www.pcmech.com/show/os/731/A google search on "restore deleted files" might help you.
http://www.recover4all.com/ links to software that is used by support techs for this purpose.
Another utility that has people complaining about the inneffectiveness of data erasing programs is at
http://www.softwareshelf.com/files/products.asp?ID=11Good luck