Where did you look for Safari and iTunes? If you looked only at the Dock, the row of items along the bottom of your screen, perhaps they aren't lost after all.
First, open a Finder window. Single click in some unoccupied space on your desktop. The word Finder should appear next to the Apple icon in the upper left.
Select the File menu and choose the Find entry. In the search box, upper right, type Safari and look at any results. If you see a line with name Safari and kind Application, single click on the line. At the bottom of the window it will reveal its actual location, something like
Macintosh HD / Applications / Safari
If you got it, navigate to that location and double click the file to open Safari. Repeat the above for iTunes.
iMac 21.5" 2.7 Ghz Intel Core i5, 8 gb, 1 tb
Beer is proof that God loves us and wants us to be happy. - Ben Franklin