Recovery

Hi,
I am facing some probs somebody put a password in my word and excel files and these files are very important for me.I want to recover the data from file.I have a utility which recovers password from files but that utility is a demo version which recovers only password upto 4 chars and i don’t have it’s registration key can some tell me the procedure to recover my files or provide me the serial no. of that software.
Software is : Advanced office XP password Recover ver. 2.0.
Regards.
Anurag.