I was looking at the information in the thread to date when it hit me that there are a few more clues to decoding this that I'd like to point out to everyone else to save the rest of you some time.
-any repeated characters can allow you to quickly decode the message after you have one letter figured out, but consecutive repeats are more valuble in the initial process
-bqn,zqw,oqw, owb and nwg are all different 3-letter words. Once I finish up some more work, I'll check them out, but remember that when you're essentially brute-force decrypting anything, playing hunches is fine. If you have a guess for one letter, re-write the line below the original and work from there for no less than 10 mins, but no more than 1 hour unless you have a reason to. That bwn ends in an "n" (see a later point for "n")
-These all being different is signifigant because you can compare the cypher-text to clear-text to get a list of possibilities.
-"zirl" has at least one vowel in it. An assuption, but a pretty safe one at that.
-"sr" also should have a vowel in it. Again, a pretty safe assumption.
-"wn and sr" has a limited number or sensible combinations, "is, an, no, be, if, of" is a good list to start from when guessing. If this is a complete sentance, sr has an even more limited number of posibilities. Odds are w is indeed a vowel, but unless you're certain, always qualify your statements.
Important -I messed up in my original .doc (hehe sorry), the information in it is correct, but the original string has one error and two omissions (that's what happens when you're working on two AP projects and a health project while you're typing.
-if we assume u, w and q to be vowels as stated by others in this thread, "kgcuuwf" has a three-vowel string, which narrows the search
-the cypher-text "n" is most likely a consonant

And those projects are calling me again, so I've got to get back to work. Good luck with this in the meantime!

P.S. google has a few word-lists if you dredge through the muck (Some useful URL's are below), but I couldn't find a program either, you just have to sit down and dedicate and hour or so to just check one sequence for possibilities and once you get two or three sequences, you can compare to narrow them down from those lists. (i.e. I put all those words in my .doc list in the possible first, then on the second pass when it was just them, eliminated a few.)

URLs:
http://dictionary.new-frontier.info/w/By_word_length_(longest)
http://www1.harenet.ne.jp/~waring/vo...sts/1-2000.txt
http://www.enchantedmind.com/html/cr...ptography.html
http://www.multicentric.com/wapi/mct...NTRIX&ObjID=84 (program, didn't feel like figuring out)
http://www.sedl.org/reading/topics/exception.html (use the syllable list)