Hi and
You can get on the Internet in safe mode? That's very surprising, and also very dangerous, as your anti-virus and firewall probably won't be active.
As for your problem, it sounds like your graphics card drivers may need replacing. Do you have a CD, or do you know the make and model of your graphics card? If you go into Device Manager (Right click My Computer > Manage > Device Manager), your graphics card should be listed there, but may have a :?: or a :!: beside it, indicating a problem.