Avast! "Warnings", but no virus found?

I have 2 “Warnings” after scan, but no viruses found. What do the “Warnings” signify, and what, if anything, should I do about them?

Thanks!javascript:void(0);

What do the warnings say ?
Without that we can’t say what to do ?

Do you mean files that can’t be scanned ?
If so avast give the reason why they can’t be scanned.

See http://forum.avast.com/index.php?topic=35347.msg297170#msg297170 this topic for more information on why files can’t be scanned.