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SYMPTOMS
The amount of disk space Internet Explorer uses for temporary Internet files may be set to 0 (zero) percent, and you may be unable to specify a different setting. In Internet Explorer 5, if you try to change the settings, you may receive the following error message:
Enter a number between 0 and 1 to indicate size of disk space for...
CAUSE
This behavior can occur if the History, Cookies, or Temporary Internet Files folder is damaged, or if a damaged file exists in one of these folders.