Well, it's hard to tell without more information, but sounds like you may have been hijacked and your hosts file was changed to block Google. If that's the case you have much more on your system that needs to be cleaned up.
We need to see a HijackThis log in order to help you get that junk off your system and whatever else that doesn't need to be there. It will also give us more information about your system that we need to know to help you.
Please do this:
Click on the link below and follow the steps in that tutorial so you can get a log posted:How to post a HijackThis Log
You can of course skip step 1. But be sure to follow all the other steps and use the links in the tutorial to:
1. Download the self-extracting HijackThis.
2. Open the HijackThis Logs and Analysis forum to start a new Topic in that forum. It is important that you post your log into a new topic in that forum. If you have any problems here is a link again:http://www.bleepingcomputer.com/forums/ind...?act=SF&s=&f=22
It may be a day or two before you get an answer. But it is also important that you not post again to the topic you started asking for help or wondering if you will get help or otherwise "bumping" your thread/topic. In order to work on a first come-first served basis, helpers look for the oldest topics with zero replies.BUT,
once you receive a reply, stay in the topic that you have started. Do not start another thread.