windows kb files "The volume for a file was externally altered" virus

Does anyone ever heard about this error message.
It shows everytime we try to execute any update file downloaded from microsoft.

i.e.: We are trying to install XP SP3 in a XP SP2 Pro box, but, after de expand files process, the error mesage is shown again.

OneCare Live on-line analisys didn't correct the problem nor Microsoft Forefront.

Tried to scan the HD connected to another (clean) box. Even it detected and erased several files, back to the original box the issue remains.

These are the basic lines, if you need aditional info, just demand it.

CatalazizAsked:
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ccampbell15Connect With a Mentor Commented:
fownload malwarebytes from http://www.malwarebytes.org/ 
Install and run

Download Gmer from http://www.gmer.net/ 
and run it

Report back with the results
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Mohammed HamadaSenior IT ConsultantCommented:
What is the file system type "NTFS or Fat 32 " ? Can you try to check your disk if there's some bad sectors that needs to be checked.

Click Start
Run
Type cmd
type chkdsk /f c: and enter
It will ask you to schedule the chkdsk on reboot, Type Y and enter
Do the same thing for the other partitions by changing the Letter C.

GL
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CatalazizAuthor Commented:
You did it.

MalwareBites identified the thread as a rootkik.
Unfortunately I can't get the log.

It's strange that Microsoft Forefront didn't found it. And even googleing about atapidrv.sys, the engine didn't found too much references.

Many thanks.
Josep.
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