Just in case anyone else tried this (my system clogged too, I manually aborted before any hint of warnings about the Eicar) and is going crazy trying to find the many gigs of temp files so they can be dumped ...
On my XP-Home, they wound up under Documents & Settings/Michael/ ....etc. I originally did a search in Explorer for extra-large files but, oddly, that turned up nothing. I finally tried re-scanning with avast with archive-checking turned off (still a thorough scan) and made a note of where it was spending an unusual amount of time due to the file sizes, and that's where they were.