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Question

WIndows 8 drop down Menu Flash

Feb 26, 2015 3:18AM PST

After being on my computer for a while the drop down menus in dialogue boxes will drop down and then back up repeatedly in fractions of a second. I can often regain control by closing the box (like Windows Explorer) but the Start icon in the bottom left of the screen does not respond. Eventually all dialogue boxes do the same thing regardless of the program This problem gets worse and worse until I reboot.
Any idea where to start looking for the culprit?

Discussion is locked

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Answer
Here's what I'd do
Feb 26, 2015 3:26AM PST

First I'd get my antivirus program up to date, install MalwareBytes and get it up to date. Then boot to Safe Mode. From there I'd do a full system scan with the antivirus program. After that do a scan with MalwareBytes.
If that doesn't help, try Grif's suggestions here:
http://forums.cnet.com/7726-6122_102-5509131.html?tag=posts;msg5578829

Good luck.

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A suspect emerges
Feb 28, 2015 5:30AM PST

I have stumbled upon what may be a suspect in causing my issue.
I went through the Critical Error reports and found one just about every day at about the same time - the time the computer is turned on. What was happening was that my wife was turning off the computer at night and hitting the master power switch. I guessing that the computer had not completed its shutdown even though the screen was black and the power cut off was occurring before complete shut-down causing corrupted files. That would show up in the morning upon boot-up.
The issue has abated in the past two days. Is it too much to hope that the problem could take care of itself with clean shut-downs?

BTW, I will be following most of your suggestions for discovering malware. Seems like a judicious thing to do.