mnrc

Hi. I have recently reeinstalled(?) my Windows XP Home because of a severe virus issue, and had to reeinstall my FS2004 and all the add-onn aircrafts and scenerys. But since then whenever I try to use some add-on features that require FSPUIC such as for example the Classic Combo for 747 Ready for Push back and others, I get the same message "one or more progr. you are using is not accredit for acess to an unrigested copy of fsuipc...etc.." Funny thing or not is that I couldn´t even (re)register my FS2004 after instalation. When I try to install the FSUIPC it keeps asking me for some registration key that obviously I never had.Can anyone help me overcome this situation? Many thanks.