Sorry to bump an old thread but since this mentions 68 Classifieds, I wanted to clarify a couple of things.
Firstly, thanks for your attempts to help this user. However, as PFMaBiSmAd pointed out, 68 Classifieds is a purchased script and we offer support to our customers. Unfortunately, this guy is using an outdated, warez copy of our script and won't receive support from us. That's why he's come here. Had he been a customer, this would've been resolved quickly.
Secondly, regarding encryption - our script includes only two files that are encrypted. These files handle licensing (so that we are able to dedicate our time supporting our legitimate customers).
Again - sorry for bumping an old thread but since this is out on the web, I wanted to add my two cents.