I was gonna mention what actellim posted, to a program that is brute forcing your login, it does not care what the characters are, it will try every possible combination up to a certain length. They don't have little asian people manually typing in common passwords. Length is all that really matters ( )
Also, never download anything or go to untrusted sites on your gaming computer, I have never used an anti virus and have never been hacked because I always use my older computers for torrents etc.
I actually spent some time reading the xkcd forum thread for that comic for more info. The truth is that real password crackers are fairly intelligent and aren't fooled at all by replacements like o=0 t=7 etc. The fact that they don't only look at single characters is why a dictionary attack is so powerful. However, if you use 4+ words, given the number of words available in english, the complexity becomes sufficiently high to guess even with a dictionary. If you go to 5+ words you can even use very common words. Throw some foreign language words or just uncommon ones (from fiction books or sci-fi or whatever that are still easily remembered) and 4 is extremely safe.