1. Open Internet Explorer (IE). Go to Tools -> Internet Options -> Programs (tab). Press the 'Reset Web Settings' button. Click on 'Yes' & OK yourself out. Check to see if it solves the problem.
2. I cannot understand what you mean by 'it disappears'. Do you mean IE disappears? You can try an IE repair (click here if you need to know how). Also, have you scanned with anti-spyware programs like Adaware, Spybot & CWShredder? If not I'll provide links to d'load them when you reply.
Don't switch off 'pop-up stopper'. Or, use the Google toolbar (click here) instead that has a built in pop-up stopper, or an alternative browser like (Avant click here) which you can configure to stop pop-ups.
Let's know how you get on. G