Google Chrome is not working?

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My computer uses Google Chrome as its main search engine (have a yahoo answers account just for this.) One day i open google chrome and there is a seperate that has bing search engine. I told my computer to switch it back to google chrome, but it wouldnt let me, telling me it just prevented something from changing the search engine just now (which is me) i go to control panel and put google chrome as my default search engine and even signed in to goole, but it still takes me to bing. IDK whats wrong, and i want to go back to google permanently. I dont want to use bing i always used google. Could someone have hacked into my account, please help.