Bro, you don't need "Copy everything from folder jdk to jre and replace everything. (yes to all)", never do this!
This is very wrong!
Why ?
Because Java has separated folders for any type of installations, you just need add him correctly to project, not merge folders.
And please, DON'T DELETE JAVA FROM PATH VARS, you don't know if another program are using these variable; just add the path of java version you need.
Resuming: NEVER DELETE, just add!