docx file opening problem

I am having a docx file with password protected which created by me only. 1 month back my OS(XP2) corropted , after installing new XP2 & Office 2007. all files are working properly, I am not able to opening my 1 file, when I am giving correct password, it is saying that wrong password. Kindly help me in this regard. why? it is not opening?