download the uninstall tool
and uninstall all the types that you did install
thats to strt with

avsrv_ful.exe = server version
setup_adnm.exe = central management point
setup_adnm_no_msde.exe = central management point without MSDE database installer
setupengpro4.exe = the old package for clients (it should not have been possible to install this one on a server)
the central management point is more complex, it indeed asks for password but then u still gotta configure it (read the manual for it

you want to install the srv installer which probably failed because you had installed other packages already
so try the uninstaller for ALL the products that you installed and then the server package