Hey mtdenise,
By default Windows 7 searches inside Files only when they are located in Indexed Locations. The default indexed locations include Libraries, Start Menu, User folders, Internet Explorer History and Windows Sticky Notes. So if you are searching for text inside files which are present in non-indexed folders such as your USB Flash drive or an External hard drive, you may not get the desired results. You can configure Windows 7 to always search inside contents of files no matter where they are located. This is the most detailed search.
Here are the steps to do this:
1. Open the Control Panel from the Start menu.
2. Open Folder Options from the Control Panel.
3. Click the Search tab in the Folder Options window.
4. Select Always search file names and contents only under What to search and then click OK.
Once you’re done with the above setting, perform a test search. You should be able to get the desired search result from here on.
A closer look at Searching techniques in Windows 7:
Advanced tips for searching in Windows**http://windows.microsoft.com/en-us/windows7/Advanced-tips-for-searching-in-Windows**
Regards,
Shinmila H - Microsoft Support
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