SAM is a PHP module. A script that is being executed, on line 1, has a require_once() function, which is trying to require the file SAM/php_sam.php, but it can't find it.
Your problem is probably a misconfiguration of php.ini (Windows installer doesn't completely make everything work 100%, because you need to manually configure things here and there). That file should be in your C:\Windows directory (possible system32, I can't remember). You want to open it and comment out all extension= lines. A comment is a semi-colon before the line.
That will fix the problem, but it will disable all your extensions. So uncomment the ones you need and test after each uncomment to make sure it doesn't produce a similar error.
You will need to go through your php.ini file and configure it to work properly with your system.
Good luck!