Internet connection, adware/spyware software, firewalls, when it started, any new software, etc.
Switch to Firefox or another alternative, even if you don't have an IE problem. Can you connect to the internet then?
Have you tried a System Restore to a time when it worked?
What do you mean "got internet explorer as my home page?" Do you mean it is your default browser?
i got internet explorer as my home page but after like 5 mn , i got a message error "internet explorer need to close sorry for the inconvenient if you are in the middle of...."