Apologize if this post came late.
This might be because of 2 reasons.
1) IE is corrupted. So optimize IE for optimum performance
Click here This will get rid of unnecessary temp files and spyware related files which is unnecessarily attached to the web browser.
2)Your computer is infected with Google redirect virus which redirects your website to a commercial site.This infection is dangerous and needs to be get rid of as soon as possible.You can find the step by step instructions to remove
Google Redirect Virus here
Both these comes with video tutorial.So should be easy to follow.
Good Luck