Thanks a lot, TryNinja! It worked perfectly. I sort of guessed this should work, but had an information overload in my brain.
Glad to hear that! I recommend generating a new seed on a offline mode of a computer, and then sending your BTC from your old seed addresses to your new one. As if malware is on your computer, the seed is now revealed on the screen and if there are spyware, they might get stolen.
Always generating a seed on offline mode is the best practice, hardware wallet is a better solution however or a paper wallet created on a linux live cd.