Hello,
Can you run AdwCleaner again and check "Enable debug mode" in "Option" menu. After that, just press "Scan" , you will still see this error message so just press ok.
Then go to C:\AdwCleaner and post the content of the file called AdwCleaner_dbg_xxxxx.log
Moreover, can you tell me what is written just above the progress bar when this error message occurs ?
Regards,
Xplode.