String Standards and PHP 5.3.8 under Win7 x64 and XAMPP 1.7.7

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Hi every:
I'm testing Concrete5 for first time but surprise when I try to install I get this errors:

Strict Standards: Non-static method Loader::database() should not be called statically in D:\Webserver\htdocs\concrete5\concrete\dispatcher.php on line 23

Strict Standards: Non-static method Loader::library() should not be called statically in D:\Webserver\htdocs\concrete5\concrete\libraries\loader.php on line 177

Strict Standards: Non-static method Loader::library() should not be called statically in D:\Webserver\htdocs\concrete5\concrete\libraries\loader.php on line 178

Strict Standards: Non-static method Loader::library() should not be called statically in D:\Webserver\htdocs\concrete5\concrete\libraries\loader.php on line 179

Strict Standards: Non-static method Loader::library() should not be called statically in D:\Webserver\htdocs\concrete5\concrete\libraries\loader.php on line 180

Any help? Should I change something in my php.ini?