Long post: XpPRO cpu: E6850 2gig ram memtest has no errors. No other problems. No overclocking. On AMD A64 3500+ does not happen. 1gig ram. I get this error only when shutting down, not on restart "The instruction at "0x009247e"(this changes) referenced memory at "0x01081e98". The memory could not be "read" The program is Executive Software Undelete, a Recycle Bin replacement. This does NOT happen when ESS is uninstalled. Did not happen with NOD32 and Outpost2008 installed. I have disabled different parts of ESS. No help. The part of Undelete is Deskund.exe and it is called with Udserv.exe an installed service. ISS firewall does not see udserv only deskund. Firewall rules are the same on both machines.There is nothing in the event log or any other errors. Drwatson included. I spent alot of time trying to find a reason for this happening. This machine is clean of any virus or malware or any other crap. I am given the option to debug, but I usually disable MDM. Don't know if mdm would even catch the problem. If anyone has any ideas thanks. ANOTHER BUD PLEASE !!!