I downloaded 3d dream aquarium screensaver, I used the keygen and crack and I was using it for like one month. Everything was alright until know because it doestn start anymore, only a black screen appears for like one second and dissapeares and then I have my desktop back again.Whned I wanted to preview it in control panel, it does the same thing. So I downloaded a few more kinds of similar aquarium screensavers from several web pages, I use keygens to start them but the same thing happens. A black screen for o second appears and dissapears and thats it. Its strange because I tried to use some of windows screensaver which have already come with my Windows and in this case everything works.