Photoshop now giving me a trial version?

A few months back in September, my parents helped me buy the new CS6 web essentials Student/Teacher edition. I used the serial code, registered it and got it to work perfectly up till this date!

Now my Cs6 Web Design and Premium has decided to go and say that my trial will expire in 30 days, and that the previous serial code I used is invalid! I helped pay for this program with months of working on art, and now my cs6 program is coming to an end!

This is so frustrating honestly, please help ASAP!