It's not a dumb question, normaly most people don't go into the registry since it's dangerous to change things if you don't know what your doing.
Warning: Take great care to only change this one value.
Click on start, then select run. In the dialog box, type "regedit" without quotes then click OK.
The registry editor looks a bit like window's explorer. To navigate you expand the folders on the left and select the one you want to see the keys in.
In this case you'd need to goto
When you click on Stereo3D, look on the right side for ShowAllViewerTypes. If it exists double click that word and change the value to 0 in the window it pops up.
Then after you click ok, close the registry editor, reboot and check your games.