Error 2 in my Internet Explorer 7

Okay, so this has been really an unlucky day. Just when I try to browse the internet with my Internet Explorer 7, it shows an error. n Error 2
I did try to browse with Google Chrome and I cannot browse as well. I really need my surfing. I did a reboot and nothing changes, also tried scanning my computer with my CA Anti-virus, but I didn't found anything that can harm my computer.
I really do hope that somebody can help me resolve this issue as I hate using my sister’s PC.
