I fixed the problem.
As I explained before i could not activate the office 2003, so i decided to reformat the PC again.
After that the first thing i installed was Windows XP SP2, I activated it. The second thing was installation of Office 2003 and I tried to activate it, which was successfully.
So after the reformat of my PC I did activated both of windows products.
I have a question: why did that happened before the PC reformat, I mean why I could not activate the office 2003?
Cheers.