Weird telephone conversation + crazy machine.

I can remember me and my friend being downstairs and I got a phonecall. It was like a silly prank call, like some bully or something, but they never said anything. Instead, it appeared that he had tricked me into a phone conversation with my friend who stood next to me. That made us laugh, I especially remember my laughter there, but he (the caller) could still hear us.
Afterwards I noticed that the number of the one who called was stored on my phone, and I asked my dad to find out who it was, several times, but he never did it, and neither did I... I kinda had some suspects though..

Well, next part of the dream my computer seemed to have gotten some sort of virus for some reason. It had turned the operative system to Windows 98, and was moving the mouse around. It also opened random black windows in the background and started typing things in weird unknown signs. I thought the virus might automatically be typing some stuff to mess up my computer even more, and I started typing things in the middle of the cryptic sentence it was writing. I was writing silly things like "lololololll :D:D:D" and such, just to interrupt the process it seemed to be doing. I also turned the computer on and off a couple of times, without any effect. In the end I thought, oh well, I've ordered Windows 7, I can format the computer and get rid of it when it comes in a few days.