this is an old topic, yes. But if anyone else is still wondering ... you uninstall Google Chrome.
Then you go to (if you're using vista, but I expect win7 to be same or similar location) C:\Users\UserName\AppData\Local\Google\Chrome\ (where you replace UserName with your actual account name), and delete the Chrome folder (if it still exists)
Then, you just reinstall Chrome and it should be ok again. This is how I got it to work on my vista machine.