crashing every ten minutes or less! Argh!

I am crashing every ten min. or less in SL and it doesn't seem to matter what I am doing or how many people are around me in my area (Louise). I have done the following things to try to alleviate this: I updated my NVIDIA driver, I ran a DSL Speedtest and packet loss test - all was excellent, >300kbps and <.5% loss. I downgraded everything visual to minimums, or near minimums, Emailed "support", I tested compatibility and it was excellent, I emptied my cache and temp folders as directed in the FAQ, all to no avail. I uninstalled and reinstalled.

The crash is to the desktop, and the crash reporter comes up. Once it was completely to a black screen with CPU still running (disturbing, I will say). What I must say too, is that the client was working beautifully (by that I mean an occasional crash), but it has become so tiresome, that I wonder if it is worth it (of course, it is, but what hairpulling frustrations)!

My 'puter:
Athlon DDR Pro
Epox 8k3a m/b w/ AMD xp-1800 1.53 GHZ CPU
GeForce 4 MX-420 64 MB
Kingston nic
256 MB DDR pc 2700
400watt power supply
60 GB HD ATA 133 7200 rpm
Windows XP

Thanks for reading - I hope you have a few tips for me. I might have forgotten some of the other things I tried.
Alain

I had/have this same issue whenever I try the latest and greatest nvidia driver for my GF3 Ti500. The only thing that consistently fixes it is to go back to the 44.03 version drivers.