Here's a simple tip.

If a complete stranger on the internet is trying to give you money, it's a scam.

You didn't win the lottery.
A Nigerian prince didn't just die, leaving a huge fortune.
An American soldier didn't steal millions from Saddam Hussain's palace in Basra.
Microsoft isn't paying people to visit websites.

If you meet a really nice person on a website who wants money... do I really need to finish this sentence?