copy this into the Chrome URL bar:
chrome://chrome/extensions/
Then, if it's there, delete wxDfast
Then, go to:
chrome://chrome/history/
And check except "Clear Saved Passwords" and "Clear saved Autofill form data"
Obliterate the following items From the Beginning of Time, by selecting that clicking on Clear Browsing Date
Then, in Windows Explorer go to:
C:\Users\<your username>\AppData\Local\Google\Chrome\User Data\Default\Extensions
and look for two folders named
cmebbaagkcgafihjgfiogjgaopnichme
enbkmjkbdgihifpdhichdpdpacjkpoag
If they are there, delete them. If not, never mind.
That SHOULD clear it up.