Moved this to VirusScan as it seems to be about that. 2 possibilities here:
1. You may have inadvertently installed an optional piece of software called McAfee Security Scan Plus - it comes as an optional extra with such things as Adobe Reader, Flash etc. it can be removed through Control Panel/Programs and Features.
2. You have a scheduled scan setuop in your antivirus and it's getting stuck and there are 2 things that can be done.
The first is to read this FAQ. The second is that a scan can trip up if your hard drive/SSD has drive-read errors on it so you need to do a chkdsk /r - if you don't know how tell me what Operating System this is please and I'll post a tutorial.
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