system
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Was doing a scan in the background while using IRC program. The scanning took up to 92% of my CPU at times.
It sounds a lot, but was it giving you any problems? If the CPU's available the s/w might as well use it.
As well the program informed me that there were numerous files that it could not scan because the archive was encrypted. Well the files in question were not archives but applications in the form of .EXE files!
I've had this as well! Avast is able to read the file names within the archive, but it can't read the files themselves. Wrongly (IMHO) it only reports the names of the archived files and doesn't name the archive itself. If you have another look at the log (if you can find it ;)) and check the file locations you might get a better idea of what's going on.
Ian G.