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Same issue here, I installed all the latest Updates for Windows 2008 R2, then downloaded 11_0_6_ZeroXI I get the "Apache failed to start" message too. Location of the Uniform Server = C:\UniServerZ if I run httpd_z.exe manually from Command Prompt I get C:\UniServerZ\core\apache2\bin>httpd_z.exe [Mon Jan 20 14:29:23.871093 2014] [core:warn] [pid 1112:tid 180] AH00111: Config variable ${US_ROOTF} is not defined httpd_z.exe: Syntax error on line 44 of C:/UniServerZ/core/apache2/conf/httpd.co nf: ServerRoot must be a valid directory If I set System Variable US_ROOTF = C:\UniServerZ and run httpd_z.exe again I get C:\UniServerZ\core\apache2\bin>httpd_z.exe [Mon Jan 20 14:32:15.058593 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${AP_PORT} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${PHP_SELECT} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${PHP_INI_SELECT} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${PHP_INI_SELECT} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${PHP_INI_SELECT} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${US_SERVERNAME} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${US_SERVERNAME} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${US_ROOTF_WWW} is not defined [Mon Jan 20 14:32:15.074218 2014] [core:warn] [pid 1468:tid 180] AH00111: Config variable ${US_ROOTF_WWW} is not defined AH00526: Syntax error on line 66 of C:/UniServerZ/core/apache2/conf/httpd.conf: Port must be specified Please advice