I began experiencing spontaneous reboots of my WinXP system yesterday, after installing (8) new Windows Security Updates.  I do not know if this has any thing to do with it or not, but all appeared stable until then.  Now clicking on any random desktop icon can trigger a restart.  Sometimes, the system will restart two or three times before I can return to my desktop.  All of the symptoms resembled bad memory. Any program that requires a lot of read/writes to the harddrive and the caching of data seems to trigger a restsrt.  I tried running Norton Antivirus and Speeddisk, but can not complete them before the systems reboots. I tried to disable Norton GoBack, but after 3-6% of the files are read I get three bios beeps (memory) and a restart of the computer. I replaced the video card to rule out bad graphics memory and downloaded Memtest86+
to check my system memory.  I ran it all night (over 8hrs) and NO ERRORS resulted.  After completing that test and several failed tries to boot to my desktop, I was forced to use Safe Mode.  When I succeeded in booting to my desktop I received repeated Windows "Your system has recovered from a critical error" popups. Can this be the cache memory of the Samsung SPO411N harddrive?  I'm running WinXP Pro on an Asus A7VX8 motherboard with (2) 512MB sticks of memory. I'm running out of hardware to check.          Thank, Ron

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