It tends to get stuck in a folder that has no archived files! Strange, I know. Either way, though, I have plenty of hard drive space for decompressing large files. In fact, for testing purposes, I told Avast to scan a 69 mb .zip file, and it handled it very well. So, i dont know. :-\

EDIT: Just had Avast scan my largest .zip file – 800 MB – and it worked fine. The memory dipped for a second, and then popped right back up. No system hang, and everything worked fine.