Thanks for the information, it does support my suspicions. We just finished cleaning up a 4.5 million record table (with child tables) that had had about 330,000 records suddenly show up in the child tables and we're trying to chase down the cause.

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>From VFP8 help: "The operating system is unable to perform a file or hardware operation."
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>Could be:
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>- bad RAM, but if that's the case the whole machine would likely be flaky, hanging and/or BSODs etc.
>- bad or failing hard drive(s), or problem with its filesystem (try CHKDSK)
>- low-level interference from an antivirus or antimalware app
>- if the app deals with data on remote computers, possibly a network hardware (NIC, cabling, switch/hub) or network redirector (client) problem causing disconnects or retries
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>You can check the affected computer's Event Logs (particularly System and Application), looking for any errors or warnings that appear hardware or network-related.