Random file appears, disappears, and won't let me in! Virus Detector doesn't like.

It's in a temporary folder. It's a temp file. I doubt it's anything to worry over. Anything abnormal about your system?

 

Given the Symantec item in the screen shot, it appears like you are running more than one AV solution.

Delete all AV software on your machine.

If you wish to run AV software, I suggest installing ClamXav.

Read the contents of the "Mac Security Suggestion" link in my sig for more details.

LogMeIn is a legitimate remote access tool but it could be used for malicious purposes.

Did you install it?

 

The red circle just means that you have no permission to access that folder. Either elevate your status or change permissions on the folder to access it.

 

If your screen pixelates like that it could be a bad LCD cable or even a logicboard going bad.

 

You're missing munkery's point. It appears you're running two antivirus apps on your Mac. You should never run more than one antivirus app on any computer, as they can conflict with each other and give false readings, as Sophos is doing, since the files in question are harmless temporary files. Also, Sophos is not recommended, as it can actually increase your Mac's vulnerability. You don't need any antivirus software to protect your Mac from malware. No viruses exist in the wild that can run on Mac OS X, and there never have been any, since it was released 10 years ago. The handful of trojans that exist can be easily avoided with some basic education, common sense and care in what software you install:

Mac Virus/Malware Info​

 

Remove your virus protection. You do not need it, period. This is not a Windows machine. I swear, it will be ok

It is NOT supposed to be there...

EDIT: Just saw this post... check out that link!