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Event ID 333 - An I/O operation initiated by the Registry failed unrecoverably

Symptom: There is Event ID 333 with this message in the Event Viewer: “An I/O operation initiated by the Registry failed unrecoverably. The Registry could not read in or write out or flush one of the files that contain the system's image of the Registry”.

Causes and resolutions: Event ID 333 can be hardware or software issue.

Software issues:

1. Some anti-virus and backup software may cause this event.
2. Disable suspect software. Or use msconfig to remove the software form the startup. Also you may try to boot the safe mode to see if you still receive the same Event ID.
3. We have seen some cases regarding “disk quota”. If the user reaches the quota, it may generate event ID 333.
4. Software may damage some system file such as TCPIP.SYS. If you receive this error after installing new software, you may try to remove it.
5. Uninstalling/reinstalling or upgrade the SP

 Hardware issues:

1. It can be NIC issue. Try to reload or upgrade the  NIC driver.
2. It can be a faulty motherboard or CPU.
3. If you suspect hard disk issue, use chkdsk /r to the disk. Or check the free space.
4. It can be defect memory.
5. It can be the hard disk cable.

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