I work at a company where we have a specific number of seats for our Visual Fortran XE Composer 2011 license. I am trying to install and register this product using a serial number that someone else has had before me. After going through the 5 step registration process, when I enter the unlock code I get the error message "repsonse entered is incorrect". Could someone please provide some insight? I tried 2 different serial numbers that have been used previously, so I think it's related to not wiping the previous owner's computer clean correctly.