Comparing google analytics with weblog expert

The weblog files and the google analytics files differ enormously.

For example in July alone my weblog files said I have 798,000 visitors to the site yet my google analytics say 172,000. What can be causing the anomaly.

I feel the google analytics is too low. But the weblog is too high. The only explanation I can think of with the google analytics is that the code is not inserted into every page. Yet I inserted into the header which is on every page.

With the weblog expert it is recording my page views in the millions. Making the page views per user look ridiculous. So I know the weblogs are wrong but don't know why?

Could the server be giving wrong data? If so how?
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