I am getting an error at boot time ( redhat 9 )....pls suggest...

May 18 10:43:22 pc2 autofs: automount startup succeeded
May 18 10:43:20 pc2 network: Bringing up interface eth0: succeeded
May 18 10:43:22 pc2 insmod: Using /lib/modules/2.4.20-8/kernel/drivers/addon/aep/paep.o
May 18 10:43:22 pc2 insmod: Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters.
May 18 10:43:22 pc2 insmod: You may find more information in syslog or the output from dmesg
May 18 10:43:22 pc2 insmod: /lib/modules/2.4.20-8/kernel/drivers/addon/aep/paep.o: init_module: No such device
May 18 10:43:22 pc2 aep1000: Loading paep module failed
May 18 10:43:23 pc2 identd: identd startup succeeded

what you have is an extra/nonstandard module hooked into your setup, that RH9 didn't originally ship with in the download ISO version. . if you have a RedHat 9 Boxed Set, you may have additional module(s) support for enterprise or server hardware not "freely" available online.
to verify this, go to /boot/config-2.4.20-8xx and scroll to about 90% of the way down, to "Add Ons" (it's just about the next to last section), and see if your aep or paep modules are listed there.

CONFIG_BINFMT_XOUT=m
# CONFIG_BINFMT_XOUT_X286 is not set
# CONFIG_ABI_VERBOSE_ERRORS is not set

#
# Addon drivers
#
CONFIG_MEGARAC=m

#
# Speakup for Section 508 stuff
#
CONFIG_SPEAKUP=m
CONFIG_SPEAKUP_ACNTSA=y
CONFIG_SPEAKUP_ACNTPC=y
CO

if not, what you have is a Third Party driver provided by whoever last had his organic digital manipulators diddling your system, and the module is misnamed, or the module has been deleted/moved/commented out.
if this is not a critical module to have, ie: everything still works dandy without it, go to /etc/modules.conf and comment them out, and see if anything changes for the worse.
as to what aep actually is, i have no idea.
actually i just thought of something: WhiteBox has AS, WS, and ES stuff in it. maybe the aep is somekind of extended or very large enterprise server support module???
luck -O.

jackpot.
under Red Hat Enterprise Linux 3 listing as i mentioned above, but not in Addons, it's in the list immediately below it in the /config-2.4...... file, as CONFIG_CRYPTO_AEP
i'm not geek enough to give you much more than this, except that it's NOT in the crypto section of the standard kernel menuconfig. it looks like a custom RHEL kernel config modification. More voodoo from Raleigh, i guess. sorry i can't help more.
luck -O.

how can I disable a module to be loaded at boot time...

it says...

May 18 10:43:22 pc2 aep1000: Loading paep module failed

how can I disable it from the startup....

delete it from /etc/modules.conf.
if it doesn't appear listed there, i'm not sure where to go, without a reconfig/recompile of the kernel. in mandrake, you just go to the kernel modules configuration gui, and that sorta made me lazy. i build a custom kernel from the generic /boot/config-2.4.xx, and avoid problems created by someone else. the only other way i ever got something to stop bothering me was to add it to the /etc/hotplug/blacklist. not sure if that would work, here.
i do believe this has placed me at my limits of geekness. or lack thereof.
hopefully someone a little more knowledgable is snooping in, here.
luck -O.

it is not there at /etc/modules.conf

I am using redhat 9

I have add "paep" at /etc/hotplug/blacklist

same error....do I have to do anything else to rebuild my "/etc/hotplug/blacklist"...

i am sorta surprised no other more technically inclined person has jumped in here on this.
i loaded up RH9 into my presario, and /lib/modules/2.4...etc... does show a aep in the addons category. what it's significance is, i don't know. if you can find someone who has a similar setup, floppydisk the aep or cd-burn it and copy/paste it into your addons, and see what explodes.
this is sledgehammer and hacksaw tech. if you get really exasperated, click on the moderator's link for the RedHat forum here, and ask if there's a different category he recommends this thread be moved to, so you could get a sensible solution.
i'm all tapped out. sorry. i'm not a developer, and the newest books i have on the shelf ( slackware 7, RH 6.0, Unix--- some really ancient thing with kde, gcc, and everything else all in the 1.xx stage.) are just doorstops anyway.
-luck O.