windows does not recognize Java

A DESCRIPTION OF THE PROBLEM :
Every time I try to start installation nothing happens, nothing. I even took my laptop to a service support who works for 15 years and he couldn't find a problem. I don't want your support or anything, just please if you can tell me why if 3 billion of people are using Java, I can't? What can stop it from instal?


REGRESSION : Last worked in version selected='selected'


FREQUENCY : always