So basically, I installed the NAV 2010 CD, right? And it worked, I even ran a system scan. But then when I switched on the computer the next day, it didn't start up (I have Vista, by the way), so I had to start it in safe mode in order to uninstall it. After that, the computer was working perfectly fine again, so I know for sure that it was the NAV 2010 that was causing the problem. Any suggestions why this is happening? Or how I can prevent it?