I'm afraid we are waiting for a word from you
We really need to know what archives cause this problems (and what is so special about the particular ones)... otherwise we won't be able to simulate it.
Well, I cannot say what archive. I can only see a lot of unpack files into the temp file and, definitively, they are related to the Screen Saver module.
There is something wrong because the files left behind by this module are not deleted.
They are under C:\WINDOWS\Temp\_avast4_\unp________ where the space are numbers.
Maybe I can analyse the 'last' scanned file to see if the remained ones 'belongs' to it.
I think the module does not delete the temp files after the their scanning but, maybe, at the end of the whole proccess and something is wrong.
If it help, a password is set to 'wake up' from the screen saver.