My parents are also both pretty clueless when it comes to computers. It amazes me the ways my Mom manages to screw up her computer. My Dad doesn't screw up much because all he does is open the web browser and hit a few sites. My Mom is always trying to play facebook games, install other games she finds, and opens every forwarded email from her retired friends.
At least they don't fall for the spam emails anymore. They once fell for the ole nigerian I send you a check for $5,000, you cash it keep yours and send me the rest scam when trying to sell something on craigslist. Luckily they had the sense to call me about it before they cashed the check. They did get as far as receiving the check though.