Dude, that sucks. Unfortunately, you are likely out of luck. If there was a way to reset the evaluation, then people would be exploiting that regularly. Most software will not allow you to reset the evaluation regardless of whether or not the expiration was legit. I have seen this with many programs.
The one thing you could try would be to set your system clock back and see if that helps. Your system time may be correct now, but are you positive it was when you installed CFB? Maybe it was, I don't know. But it is worth a shot (unless you are running other evaluation software. Messing with the system clock could cause you issues with other programs on your system).
If possible, perhaps you could install a virtual machine (using an evaluation copy of Windows Server or something) and then install CFB on there for your trial period. I know it is less than ideal, but when bad luck strikes, we sometimes need to make compromises.
Yes, I figured it was a long shot but thought I would post anyway. I was also curious if this had happened to anyone else. I have been using Dreamweaver for years but have only played with Eclipse off and on. It seems that Builder is the way to go now so I was looking to get more involved with it this time around. Luckily the company I work for has agreed to buy a license so I will just wait for that to come and use it then.