I had to take my iPhone into the Apple store for repairs, and made the mistake of upgrading to 3.1.3
Now I have my SHSH and what not all stored up in Cydia, but thats not my problem. When it comes time to run quickpwn (after the two failed attempts at installing the 3.1.2) windows immediately shuts down quickpwn22 and says it has encountered an error. It does the same thing when I try to run blackra1n.
Try doing it from a different computer. You'll need to use quickpwn. If you use blackra1n, it'll hactivate your phone and you won't be able to get service, even if you're with an official carrier.