Oh, so it's not really unp- files in the TEMP folder, but rather folders with ordinary files inside.
According to the content, it looks like installation CABs of Windows, or something like that. I'll check for exact match when I'm at work (what operating systems installers do you have on your disk?).
Now: this problem appears only with the screen-saver module? The other scanners, running with the same packer/sensitivity settings, scanning the same area, don't leave the files in TEMP folder?