access denied

“Bootup cannot find System32/Drivers/isapnp.sys. It is missing or corrupt.”
I found it in the Drivers directory so it’s not
missing. I know a copy is on the disktop, also on a backup disk and copied it to a floppy.
Window does not accept copied files or directories. Cannot access any file or folder because “access is denied”. I used the 6 Boot Disks to get into the repair console which gets you the C:\WINDOWS cmmd. I am administrator with
no password and that may be the problem plus the
Ghost Restore Disk that can’t be accessed. I don’t know how to get pass the “access denied” response. I thought of changing the attributes, I don’t know how. The XP DOS is limited.