Requiem level six has gone spastic...help!

[ChrisTiff]

So, very much lovin the games. Stoked to have made it through to Requiem and find out how it all ends. But now it seems I am doomed never to know. I reached level six to find all the levers were glitched so i couldn't grab them and that the graphics had crapped right out. I searched everywhere and tried everything from savegame zips that weren't compatible to full Penumbra updates which i've yet to discover the success of since I apparently need to re enter my serial number. Unfortunately, I no longer have it. Which sucks.
Is it possible for you to resend that number and/or help me with the glitch?
I've repaired my harddrives permissions too so Im hoping once i can get back into the game it will be working.

THANK YOU THANK YOU for your help.