I am not sure I understand your question. In the first part are you saying that when you rebooted, your computer used to go into scan disk but now it goes straight to your desktop? If yes then that is a good thing. To get scan disk when you boot, your PC must have been shut down prematurely: ie you turned the power off before the shutdown process had completed. The PC realises you have not shut down properly and thinks there is an error with your hard drive and so initiates scan disk. Now your PC shuts down normally the PC does not think it is necessary, which is good. In the second part are you saying that when you run scan disk you can only complete it in safe mode because when in normal mode it looks as though it freezes? This is also correct. In normal mode background processes are continually writing to the hard drive which forces scan disk to abort then retry. It looks as though it freezes then eventually it will quit with an error stating that it has tried x amount of times then has given up. In safe mode (or DOS mode which is when it runs outside of Windows) there are less processes to interupt the scan and so the scan disk task is completed. This is similar to defragmenting which I also recommend running in safe mode.