W97M/Reiz is a destructive Word trojan.
When a trojan document is opened, it creates a batch file, "Autoexek.bat", and an AutoRun file to the root of the "C:" drive.
When Windows is restarted, the AutoRun is enabled and when the "C:" drive is accessed via Windows Explorer or My Computer the batch file is executed.
The batch file shows a message:
Updating! This May Take A While... Please Wait...
and then attempts to remove everything from the "C:" drive using "Deltree" command.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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