Blank screen when log on

Hi guys. When I turn on my Toshiba laptop all is good at first sets up and the user screen comes up with my profile and another one i set up but when i enter my password it says welcome and the icon spins around and then i get a black screen with a white mouse icon. same for the guest profile. My internet security did run out last week but ive only get emails. No 'dangerous' sites.
I have turned t of restarted, took out the battery for 60 seconds etc. I can get into safe mod but the internet wont work in there.
Any help greatly appreciated.