Remove the WinFileCache-7A9586CB.dat file from the Dreamweaver user configuration folder. If that doesn't solve it, then recreate the Dreamweaver user configuration folder.
Delete FileCache.dat files from the Dreamweaver user configuration folder.
Dreamweaver CS3 on Windows Vista:
Dreamweaver CS3 on Windows XP:
C:\Documents and Settings\[username]\Application Data\Adobe\Dreamweaver 9\Configuration
Dreamweaver 8 on Windows XP:
C:\Documents and Settings\[username]\Application Data\Macromedia\Dreamweaver 8\Configuration
Dreamweaver 8 on Windows Vista:
Dreamweaver CS3 on Macintosh:
Mac HD/Users/[user]/Library/Application Support/Adobe/Dreamweaver 9/
Dreamweaver 8 on Macintosh:
Mac HD/Users/[user]/Library/Application Support/Macromedia/Dreamweaver 8/