Windows 7 Ultimate 64-bit search doesn't find correct data?

I am using the search found, when you click the Microsoft Windows flag/symbol/orb.

I search for a word: episodic.
The results are only 1 word document which has a question: What is episodic.

The Windows 7 search does not find my 2nd word document which has the answer: Episodic is...
nor does Windows 7 search find other powerpoint lectures and presentations including the definition of the word episodic?

Can someone help as this is just one example of many failed Windows 7 searches.

I think the search from the start menu only searches for file names (don't know if there's a way to change that). To find text within files you could use the search function in Explorer.

Thanks, I just tried that.
I went to Computer. Then entered the word 'episodic' into the search field on the top right.
Windows said 'No items match your search'?
Any other ideas please let me know.

Search from the start menu only searches for files in the locations you have set to be indexed.

You can change the folders to be indexed:

http://www.sevenforums.com/tutorials/17854-index-locations-add-remove.html

You can also add or remove different file types that it searches for:

http://www.sevenforums.com/tutorials/18212-index-add-remove-file-types.html

And, you can configure it to just search for file names or to also search the contents of the files:

http://www.sevenforums.com/tutorials/36098-search-options-change-restore.html