Are you sure it's the entire computer? Usually it will scan all associated registry keys as well as that actual file, so it sometimes appears to be scanning a lot more, but if you let it run it will complete pretty quickly.
Try running the Virtual Technician to see if there are any problems that need repairing: http://mvt.mcafee.com/
I had already ran VT, everything was ok. I was using this before I had to reload McAfee because of the internet connectivity problem that McAfee had with AT&T, so I know how it should work, but now if I right click on 1 file Quick Scan opens and starts scaning in the Windows/system 32 dir., after the first 1053 files are scaned without scaning the file I right clicked on, I shut it down.
OK I believe you. There have been a few reports of this happening but we Moderators can never reproduce it. Best to open a ticket with Technical Support if you wouldn't mind. They're linked under Useful Links at the top of this page and it's free by phone or online chat.
What? How crazy. I'll ask about this on our conference call on Monday and get back to you. Just for my info can you post your operating system and service pack info plus the version of SecurityCenter - open it and click About.