whatishappening

I've started a custom in-depth scan as admin and it's been over an hour and the objects scanned have been sitting at 1789 since the start. I've noticed that the scanner takes a very long time scanning some files like ci.dll, mi.dll and ping.exe. I've also noticed the scanner going back to scan the same files again and again like ci.dll. I can't even stop the scan, it's been 5 minutes since I clicked on pause and it's still scanning.