oh dear . . .that doesn't look good
I seems like something in the sytem user is corrupted or messed up. On my old pc I had a similar issues with freezing. While I was able to fix the issue I had to create a new account and transfer all my stuff over to get everything back to normal.
When you computer starts you shoud try and press F1 and see if you can fix the solution in there. I remember doing that a few times. Someone with more knowledge in that area could be of more help.