Computer will not log on passed welcome menu

Hello,

I have a Hp Compaq Desktop I bought in 2007. I tried to log on my computer this morning and it will not go passed that welcome menu the screen just go a soild blue. I try to restore tht system and tried to reboot
it will not allow me to. I try to log on in safe mode it will not let me, it just goes to the blue screen. And recovery disc did not come with this computer I was surpose to make one but I didn't . I want to know is there anything that I could do to repair my system myself or would I have to put this computer in the shop. I don't understand what happen this computer was working fine the night before I had no problems. But I did try to download
Internet Explorer 8. Can someone tell me what i need to do.


yxat