Cant open apps, really slow, really long pauses, error 50 messages (i don't think it's in root user it didn't give a disable option)??

Hi! My macbook pro is barely working suddenly and I dont know whats wrong. It's not allowing me to open most programs or only one at a time, even trying to type a sentence it keeps pausing for moments at a time. I have recieved error 50 messages about most tasks. This just started today and I tried to disable root user but it wasn't enabled or didn't give an option. If anyone has suggestions or similar problem today I'd really appreciate it! Thanks,
Amber

Hi Amber,
Any changes recently, hardware or software?
Do you have at least 15% free space on your HD?
Is your RAM being recognized? (Apple menu > About This Mac > More Info > Hardware > Memory)
Have you looked in Activity Monitor?
Sometimes a process can run amok and use more of the CPU than it should, potentially causing a slowdown and/or heat issues and/or other issues. To check on this, first use your Mac as you normally would, the longer the better (checking this right after starting up may not show you anything). After you’ve used your Mac for awhile (again, the longer the better), go to Applications > Utilities > open Activity Monitor > in the top menu at right, select All Processes in the drop down menu > click on the column heading titled % CPU (this will update continuously, showing the percentage each process is using) > toward the bottom left of the window, click on CPU (this will show % Idle, which will also tell you how much of the CPU is being used).
How much RAM do you have?
One way to get an idea whether more RAM will help or not, is to check Page outs and Swap used. First, use your Mac as you normally would, the longer the better (checking this right after starting up isn’t likely to show you anything). After you’ve used your Mac for awhile(again, the longer the better), go to Applications > Utilities > open Activity Monitor > in the top menu at right, select All Processes in the drop down menu > near the bottom of the window click on System Memory. If Page outs is more that about 10% of Page ins, and/or Swap used is large,chances are good that adding RAM will help. http://support.apple.com/kb/HT1342
Exactly which MBP do you have?
Have you repaired permissions? Repaired disk? Reset SMC?

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