*Sigh*... my computer crashes often when I use the internet. It is
apparently completely random, but I am not sure. I am currently using
Lynx in a terminal shell, to prevent the entire computer from locking
up if it happens again (although the terminal session freezes). I am
pretty sure the problem is software (it crashed in Mandrake often, but
not in Fedora). Oh, and my distro is Slackware 9.1. I have an Intel
PRO/100 ethernet card (eth0), with a PCX1000 Toshiba cable modem. I
use DHCP, by the way. I would like some help ASAP (I am a Net addict).

that happend w/ me...i had to disable acpi with the command "acpi=off noacpi" in the grub argument line...upgrading to 2.6 may also work if you like acpi. You could also turn it off in the BIOS...this also may not be the probelm at all...but it worked for me.

does it crash when doing other things?? what about games?? form your brief description it almost sounds video card related....need more info though..is it random..did you go thru your logs??

This could be a memory problem. Is your RAM all the same? Have you tested it using http://www.memtest86.com/ -- J.W.

OK... some more details. I use LILO instead of GRUB, and don't have
ACPI support in the kernel (no module either). However, it is turned
on in the BIOS, and I can't turn it off. It is in the S1 state. Also,
there are no memory problems. I got my computer from Gateway, and the
strange crashes didn't happen on Windoze. It isn't my GFX card,
either. My ATI Radeon 9700 Drivers didn't constantly crash my computer
on Fedora Linux Core 1... Still, I found something wierd in my syslog.
There's something repetitive in it, and it is:
"(Time) localhost kernel: eth0: wait_for_cmd_done timeout!
(Time) localhost last message repeated x times
(Time) localhost kernel: eth0: Transmit timed out: status 0050 0c80 at 11850/11910 command 000c0000."
This loops constantly until I reboot by force. It happens in both
my original 2.4.22 kernel and my newly compiled 2.4.26 kernel. Now, I
seriously doubt it's random...

Just an idea why not try a 2.6 kernel? I had a nic card once that was totally screwey.. i just bought a different one they are cheap.. sometimes weird things happen with them and are truely unexplainable.

... well, I searched my computer, and found out that the apm and acpi modules may have been loaded at startup... I commented out the startup lines in rc.modules, and installed the official Intel PRO/100 driver just in case, and it worked... thanks for your help (especially vdogvictor)!