Drag /Users/<Problematic
User>/Library/Preferences/com.apple.internetconfig.plist and
com.microsoft.explorer.plist to the Desktop. Re-launch Entourage and see if
it crashes. If it doesn't, delete the file. If it does crash still, move
the file back.
Try repairing permissions.
For OS 10.2/10.3:
Go to Macintosh HD/Applications/Utilities. Open up Disk Utility. Select
your hard disk, then click the First Aid tab. Click the button to "Repair
Disk Permissions".
For OS 10.1.5:
Download the Repair Privileges utility, free from Apple, and run it:
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http://docs.info.apple.com/article.html?artnum=106900>