How did this guy hack my system?

[Sharks445]

So I run a web server, so my computer stays on all night. I also have RDP (remote desktop) on as well. So one day I wake up and see that some dude from Africa created a new account on my computer through RDP. I only had a guest account on, and my main one has a password, so I was wondering how the * did he create a new account? It gets worse. The new account he created was ADMIN. This dude made himself admin on my PC. So I figured maybe he cracked my password. So that day I deleted his account, turned off guest account, and changed my password. The next day I see this dude created a new admin account AGAIN. Unless he has some logging software, (which he doesn't on my PC) I am still trying to figure out how the * someone achieved a huge feat in hacking. Anyone got any ideas?

 

[Hat In The Cat]

There is a possiblility that your password Isn't strong enough but still... Brute forcing takes a while. The people that get passwords in a couple minutes are EXTREMELY luckey if they cracked a complicated password. Brute forcing can take months to accomplish. If I would guess what he did is, you have or had a key logger on your system. That's how he got your passwords. Key loggers are EXTREMELY easy to make. It can probly take a noob 30 mins in c++. And there is the possibility that he is a extremely intelligent hacker. But I don't think someone like that would be messing around with RDP and trying to hack you.

I hope this answered all of your questions!