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.