The rescue disk should automatically put you in as a root user, so there should be no need of su'ing to it. Its rather strange that chroot is not working, one thing to keep in mind is that the linux shell is case sensitive, so typing "CHROOT" instead of "chroot" will not work. Also, did the rescue disk show any errors while loading up?
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Hardware - Celeron 266 MHz, 128MB RAM, Intel i740 8MB RAM
Software - Slackware Linux 10.1; Archlinux 0.7; Windows 98 SE
Humanware - GS/CS C++ L+++ w b+++ DI+ D+ e
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