When my computer opens a webpage, something green will appear.

Have you installed the Jinshan net shield? Did you find that the icon of Jinshan Net Shield is also green?

This means that it is protecting your computer.

Then take a look at it:

Select Tools/Internet Options/Universal Lottery/Colors/Use windows Colors in the menu bar of IE browser. Here's a problem.

May be poisoned again. It is best to kill virus in safe mode.