Finder error after taking screen shot, apple button not working either So I've had this macbook pro for maybe 4-5 years and I think it's on its way out. Startup is sluggish as hell, I cannot open EVE Online Launcher or Steam at all, Microsoft Word hangs on startup, Chrome sometimes beachballs and I can't even open the right-side options menu, and I cannot click the Apple icon on the upper left without spinning-ball every single time (hence why I cannot even check what version I'm on!)

I've reset NVRAM, but it fixed nothing.

Is there anything left I can do that doesn't involve replacing physical components?

EDIT: Taking a screenshot made Finder go unresponsive.


EDIT2: after another crash from clicking the apple button
OK, lets do this. 

In Terminal run launchctl list to see all programs running. 

Then anything that does not start with com.apple.... 

Quit or Delete and make sure it is not in you Login items (automatically starts when you log in)

Check your CPU load and Memory load in Activity monitor.

Gaming sites like Steam might run limits on your GPU.

Lets close and quit all 3D party apps, like coconutBattery and others.

The goal here is obvious. Free you OS X and see how it runs then.

Since your Finder just crashed, Open the Console and select Errors and Faults, then take screen shot and publish.