Hey mate, when you open google, do you get this or something like it?:
If not, try logging out and exit browser, then log back into google. Sometimes you need to enter search terms before you can change settings. After that, the option to change to video/picture/etc is on the left side and the top of the browser window. Change safe mode by clicking the cog wheel to the far right of the window, towards the top. Then change search settings.
If that doesn't work, try deleting your cookies and try again.
Alternatively, you could try Bing
, which some suggest is just as good as Google.