A number of Exchange guys are posting in various forums about this error message that appears very early in the Exchange 2013 setup process. The solution is really simple.
The issue is brought to light when you get the error message below during step one of the 2013 installation on Windows 2012.
Error: The following error was generated when “$error.Clear();
install-ExchangeSchema -LdapFileName ($roleInstallPath + “Setup\Data\”+$RoleSchemaPrefix + “schema0.ldf”) ” was run: “The system cannot find the file specified”.
The system cannot find the file specified
--> please see the rest on the blog : http://www.howexchangeworks.com/2012/09/the-system-cannot-find-the-file-specified-error-on-step-1-of-exchange-2013-setup.html