Well, I just booted up again and it was fine. No DANGWEM (Damn Annoying Non-Genuine Windows error Message), so I guess everything is fine. If there is another problem, like this, I'll tell you. Thanks.
-Not running MSE
-Norton was pre-installed in the laptop, but since I have not enough money to fix the computer if I mess something, I've kept it, but I've excluded his folder from all scans and I'm closing his scan windows when it comes up up (every thursday on 20:00). That's all.
-Safe mode is... F8 when the computer is booting, that's it? I'll remind it.
-Could you explain me what's "Safe Mode with networking"? It seems useful, but my laptop is not linked to another computer.
-For the last time, during the DANGWEM apparance, only thing I could do was using FireFox, thanks to the "Validate Now" option, who brang up a FireFox Window. Howewer, it ran for hours and has done nothing. (Yay for multi-tab browsing!)