scannibg warning message

hello,
avast reported this warning message after scan of hard drive. Is this a sign of virus? or just a error message?

thanks

SYSTEM 1488 AAVM - scanning warning: x_AavmCheckFileDirectEx [UNI]: C:\Program Files\Common Files\microsoft shared\OFFICE11\msxml5.dll (C:\Program Files\Common Files\microsoft shared\OFFICE11\msxml5.dll) returning error, 00000017

In my opinion it’s a sign that you have a problem with the hard disk.
Try to run a disk check on the C: drive, including the surface scan (checking for bad sectors).

thank you igor,

error-checking of hard drive did not report any error (I choose no automatic repair option during disk scan).

I instruct system(Vista) to perform full disk check during system boot. then I performed full virus scan on hard drive, the warning message is gone.

like you said, It could been disk error.