The logs are clean.
Run CCleaner.
Go to
Start >
Run and copy and paste next command in the field:
ComboFix /uMake sure there's a space between Combofix and /
Then hit
Enter.
This will uninstall Combofix, delete its related folders and files, reset your clock settings, hide file extensions, hide the system/hidden files and resets System Restore again
I will look around for some info. on the sn12.mailshell.net pop up and see what I can find.