Hey gregofdoom. Theres a few possibilities of this error occurring. Usually it happens if youve run out of disk space or memory and the QT is having troubles writing to the database. Your "keypool" is a bunch of addresses that the QT keeps in memory every time it starts. Can you send me a bit more information about your system and check your available disk space for me?

Another thing to check just out of curiosity is try running the QT with administrator privileges, its possible that the wallet.dat was locked to read only for non admin users, if you ran the wallet the first time with raised privileges.