Like Moab mentioned your safest bet is to uninstall and then reinstall Chrome.
If regular uninstalling doesn't work, completely remove anything Chrome related. Go to App Data in your Windows profile
C:\Users\UserName\AppData\Local\Google\Chrome\ and delete the folders there. Do you want to be really sure? Run CCleaner to remove whatever temp-files and cached stuff might be left behind.
As long as you are logged in to Chrome, all your settings should be synced (unless you turned it off) so after reinstalling and setting up the syncing again, you should have all your settings back too.
Most likely there were some flags (check about:flags) turned on that might conflict with one of your extensions. So just to be sure, check about:flags before setting up syncing and make sure they're all turned off. That's the best way to be sure that the problem is not caused by Chrome