Are you overclocking your computer, or using some sort of 'helper' software?
GW has detected that the checksum on its files are wrong, downloads them again, and calculates a new checksum.
Overclocking can lead to write errors to harddisk, and 'helper programs' is exactly what CRC checking is there to defeat.
Another possibility is that you have physical errors on your harddisk. That is bad, as they tend to spread and successively corrupt more and more files.
I hesitate to suggest uninstalling GW, deleting the directory, and reinstalling, because you'll need to download all updates again - and that's a pretty big download - but that would be one way to be sure the problem isn't related to something with the GW installation.
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