Computer freezes within a minute of logging on after recently formatting dr

Hi... My disc has just been reformatted, it went absolutely haywire after the end of my first year, but afterwards the computer was running ok.

Now, when I switch my computer on, it loads up fine, but then freezes and does nothing after about a minute of me logging in and everything loading up.

I am not connected to the internet on that computer at the moment... Does anyone have any advice? All I can do with it is hold the off button and switch it off, and this freezing happens every time.

 

I can start it in safe mode, but it freezes just the same as in normal mode after a couple of minutes.