complete scan in CIS v7 doesn't complete

I have tried complete scans on two consecutive nights. I have let it scan overnight both times. When I woke up both times, it was showing 100%, but it was still scanning a file with a .NUT extension. I let it go for another couple of hours but neither scan terminated correctly at 100%. Surprisingly, I click on scan and it shows the several types of scans with an updated date. Its strange that it is getting to 100%, but still attempting to scan this file.