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Posted

Has anyone else experienced issues with windows XP today.

Around a dozen of our remaining XP computers have come up failing to boot with a missing HAL.DLL file. However solving it is proving difficult. XP repair fails to work . Replacing hal.ddl manually results in a report missing NTOSKRNL.EXE file too. Replacing both then results in a dll file missmatch error. It sounds as thought there are other associated files and of different types depending on system too. But it's strange why have they all failed this morning.

Posted
What AV are you using? There have been instances in the past (AVG springs to mind) where a bad definition update caused false positives on a bunch of system files and quarantined them, rendering the system unusable. Not aware that a large number of different files have been affected before though.
Posted
We have around 20 XP machines failed since yesterday evening with same issue. Windows 7 machines still fine. We use centrally managed Sophos AV. Did occur to us about false positive situation but sophos logs for failed machines show no reports of action taken recently on those machines. A colleague has got one machine running by copying contents of system32 and inf folders from one machine to another and now machine boots into windows but obviously this will have caused driver issues and probably some other funnies.
Posted
No idea at present what caused this. Repair is proving unworkable due to amount of messed up DLL's etc. Looks like best option is re-clone affected machines or on newer ones take opportunity to upgrade to windows 7.
Posted

Is your Sophos set to delete or quarantine on infection?

Also had this when Sophos picked up a bad definition file - Support recommend the cleanup policy be set to deny access only.

That way if there is a problem it wont eat half of your hard disk if there is a bug detected.

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