I have had this problem for awhile now, and I cannot put my finger on when it started as to what I may have done. Neither my cd-rom drive (Plextor) or my DVD drive will install anything. I can read what is on them, but the setup.exe files will not start an instalation. I also cannot do a network install of a program, yet it will install on the other computer. I can install programs that are on my hard drives. I have replaced the ikernal engine in InstallShield with no results. I'm running Windows XP Pro. I have tried a re-starting from the last known good configuration, but that also did nothing. Any clues EXCEPT for a clean install (I have to do some prep work before I'm ready for that option, and I don't have the time right yet to do it). Thanks..........KGBeastie[FONT=Tahoma][SIZE=10][B]