Go to Portable Timekeeper installation folder, locate the ST6UNST.LOG file and move it to your desktop. Run the uninstaller and when you will be asked for the log file, use the Browse option to navigate to your desktop and to open it. If this doesn't work, you can remove the software using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.