Denied access to SCSI Drives

What am I missing? 3 1/2″ floppy drive, CD-RW Drive and DVD Drive deny me access. Drivers uninstalled and reloaded. Ide drivers reloaded. Drives work in another computer. 3 1/2″ floppy will format disks. Windows permissions seem to be ok. Still denied access. What to do is the question. Can not repair windows with cd disk as drives Deny Access. Perplexed but not yet frustrated.