C:\Users\ChrisM\Appdata\Local\Google\Chrome\UserData\Default\WebData:mywebsearch.com
browser hijacker, try this
run AdwCleaner..... [b]click delete[/b].... post log here
you find it here http://forum.avast.com/index.php?topic=53253.0
to check for any leftovers, also attach a OTL diagnostic log