Taskbar Slow To Respond When Display Turned On

I have my computer power settings on high performance and I'm using Windows 7. Whenever I "get off" my computer--whether it's to go to bed or work--I leave the computer on and let the display turn off. When I come back to the computer hours later, I jiggle the mouse to "wake" the monitor and the time in my taskbar reads a time a few hours behind the present. I have also noticed that I cannot click on any icons on the taskbar during this time. After a few seconds, the time updates and I can click on the icons.

Any ideas what could be causing this? Not sure if I should check something hardware related or software related.

I tried to do a clean boot and got the black screen of death. Some people on other sites say that getting a new mouse helps, which kind of makes sense because I have a logitech mouse and have had problems with it in the past.

I already did a repair install to fix another error, but this one still kept happening. The memory diag test would tell me if something was wrong, right?

andrew129260 said:

IF you cannot resolve, I suggest a clean install. But I still think it has to be a program causing the behavior.

If I had to guess, I would say it's ESET. I noticed when I tried to do a clean boot, it disabled all of my startup programs except for ESET. But it's my AV so I don't want to uninstall it lol.