I'm using Total Protection (from McAfee via subscription) on my PC. Have latest version (VirusScan 15.0.288, for example). Running Windows XP SP3. The machine is a fairly fast 8-core beast although it is coming up to 3 years old now. My C drive is 2 SSDs in RAID 0, so fairly fast and I have a couple of TB of hard drives internally plus some externals.
I've a number of large DV format avi files on my (internal 500GB) D drive (some well over 20GB). They've been there for several months and never seemed to cause a problem for virus scanning in the past. A day or two ago, the latest version of McAfee downloaded onto my machine. I started my weekly scheduled full scan at midnight last night. Normally a full scan takes roughly 45 minutes but when I got up this morning the scan was still in progress. The scan seemed to be stuck on one of the big avi files. The disk access light was on continuously but when I ran task manager, CPU activity was down at just 1-2 percent. I tried to end the scan in the McAfee window but no success. Shutdown from Task Manager got part way there but then also hung up with the disk access light still on. Eventually I had to use the power button to shut down.
Today I've tried various things to investigate. I ran virtual technician but that came up with no problem. I uninstalled and re-installed completely, from McAfee website (using the recommended clean-up procedure) but then a manual scan still came up with the same problem. The scan gets through everything on the C drive in about 10 minutes and then moves on to my hard drives. A moderate amount of smallish stuff on my D drive is scanned reasonably quickly over the next few minutes. Then it gets to the big avis. The first two or three avis are a little below 20GHz in size and seem to scan problem-free in a few minutes each. It seems to be when it gets to the bigger ones (around 23GB+) that things seem to hang up.
I suspect that things may not be hanging completely as the files where it starts to hang up are not the same one where I found it stuck after the overnight run so it may just be running extremely slowly (in fact, in my attempts today I've found that it doesn't always hang up in exactly the same place - on a couple of occasions it hung on the first big avi but on one occasion it got through that one and stopped on the next - slightly bigger one). If it is still progressing, however, it's certainly taking several hours per file, as opposed to the few minutes per file previously. I always end up having to power-off as I cannot end the scan or shut down when it gets into the problem state.
I thought about drive faults or file corruption but looking at the D drive with HDDscan shows no problems and I can copy or play the problem avi files quite normally in Windows. It just seems to be Virusscan which is hanging up. Just for the record, the same problem occurs with a custom scan on just the D drive. Nothing to suggest I've any malware on the machine and the McAfee scans (as far as they get) come up clean as well as other scanners I've tried (Windows Defender and Malwarebytes to be specific).
Anyone got any ideas? Has the latest version of Virusscan got a problem with these big files?
(As an aside, I also noticed that, when doing my custom scan on just the D drive, it was occasionally scanning files from the C drive too. Is this normal?)
Thanks for any suggestions.