OSX 10.3.9 Boot problem

Last night I was running some RAM-intensive programs for a while and my computer was getting pretty hot temperature-wise. I was running with 3.5gb of hard drive space and wasn't receiving any memory notifications (as you sometimes get when running close to HD capacity).
Then my computer froze up: pinwheel of doom....
After that my computer wouldn't boot, or get past the grey screen.
I ran disk utility and tried to repair the "Macintosh HD" volume of my hard drive. One problem was repaired, the other problem could not be repaired.
Having backed up all my files about two months ago I ran an "Archive and Install" with saved preferences. My computer booted back to OS with relative ease. I deleted my Previous System Folder and restarted my computer...
It took nearly fifteen minutes to boot and once it showed my desktop, before even the toolbar at the top or my desktop icons showed up I got another pinwheel of doom and I had to force it to shut down. What's going on?
I replaced the system folder, so it shouldn't be an OS issue. Is it possible I have a damaged hard drive? Can that be caused by the computer running at too high a temperature? If the hard drive is bad, why would I be able to re-install OSX?
Anyone have some advice?

You should run with less than 15% empty space on your hard drive otherwise you will experience problems like you just did. Don't wait for messages. A memory notification is not the same as your HD is full.

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