I completed up to this stage

Now xaamp running and database ready.

then I typed localhost/account- I received the following error. 

several times I uninsttaled xaamp and tried. still same error

kindly guide

Fatal error: Uncaught Error: Call to undefined function user_company() in C:\xampp\htdocs\account\includes\errors.inc:86 Stack trace: #0 C:\xampp\htdocs\account\install\isession.inc(87): error_handler(8192, 'Optional parame...', 'C:\\xampp\\htdocs...', 378) #1 C:\xampp\htdocs\account\install\isession.inc(87): include_once() #2 C:\xampp\htdocs\account\install\index.php(18): include('C:\\xampp\\htdocs...') #3 {main} thrown in C:\xampp\htdocs\account\includes\errors.inc on line 86