I searched for ~erafswd.tmp and could not find it. Where might it be located. I will not deny I'm BRAND new to this program. But loosing all this free space has made me very nervous. I didn't stop washing free space I allowed it to work until it finished. I am getting very worried.
Try clearing your system restore history (google it), that may release quite a bit of space as well. Sometimes Windows thinks that the files Eraser uses to clean your disk are system files... and logs it in System Restore.