Thanks for using Sitefinity.
Due to limitations in IIS6 with default character mapping, Sitefinity deployment requires different steps than deploying it IIS7+. Please read our documentation for IIS6 carefully.
I hope this helps.
Thanks for the response better late. I would like to inform you again, that it works fine on stage with similar environment and does not work on production.
Once again, I would like to inform you that BOTH THE ENVIRONMENTS ARE IIS6 AND WINDOWS SERVER 2003.