Windows 7 Search isn't very good, I typed some words I know to exist but it was incapable of searching the text inside the log files.
By default Windows 7 won't search the contents of .log files. You can fix this by going to Indexing Options (search the Control Panel) -> Advanced -> File Types. You'll still need to click the "File Contents" button on the actual search page unless you choose to index your log directory.
