Open the Settings app on your watch. Tap on the top item, Time. Tap on the button in the middle of the screen. Turn the Digital Crown to adjust the time; tap Set when done.
Windows Vista does not have sufficient protection on it's own. Avast is legit, and it runs on the background, because it's protecting your system all the time. Run an updated full scan with: Malwarebytes and Spybot Search & Destroy Therafter check through with your anti virus, just to ensure it still works.
The particular thing about this VPN service from avast! is that it's integrated with the UI of the antivirus software. You can find it either in the tools menu, or on the main screen of the app, as it has a big button dedicated to SecureLine.