Once you purchase the McAfee protection, it will stay with your account/computer so you will not lose it when you get your computer back.
If you can take a minute and use the rating system to rate our session as 3 stars or higher and press Submit so I am credited with helping you.
Depends what kind of repair was it.
If the guy formatted your machine then you wont have it installed.
But since you purchased it, you can install it again and your period will continue till the date mentioned on your license.