Q: my macbook pro is acting up cursor is moving on its on.  Think I have a virus does anyone know how to get it out.  I tried the update but it didnt work

I doubt that you have a virus. Are you using a usb mouse or the trackpad on MacBook? If you are using a usb mouse, disconnect the mouse to see if the cursor still moves around. If you are using the trackpad, is the battery warped. I understand that a warped battery can cause this type of issue. Also download and run the etre check tool from this site: http://etresoft.com and paste the output here. We should be able to determine from the output if you have some kind of malware on the system.

Also visit the site "http://thesafemac.com" to read more about viruses, malware, and adware. It has list of known malware and adware as well as a tool to search for these files on your system and move them to the trash can.

There are several possible causes for this issue. Please take each of the following steps that you haven't already tried until it's resolved. Some may not apply in your case.

1. Follow the instructions in this support article, and also this one, if applicable. A damaged or defective AC adapter could be the cause, even if it's the right kind.

2. Press down all four corners of the trackpad at once and release. If there's any effect, it's likely to be temporary, and in that case the unit must be serviced or replaced.

3. Open the Bluetooth preference pane in System Preferences and delete all pointing devices other than the trackpad, if applicable. Disconnect any USB pointing devices. By a "pointing device," I mean a peripheral that moves the cursor, such as a trackpad, mouse, trackball, or graphics tablet. A plain keyboard is not a pointing device.

4. Start up in safe mode and test, preferably without launching any third-party applications. If you don't have the problem in safe mode, but it comes back when you restart as usual, stop here and post your results. Do the same if you can't start in safe mode. If there was no difference in safe mode, go on to the next step.

5. Reset the System Management Controller.

6. If you're using a Bluetooth trackpad, investigate potential sources of interference, including USB 3 devices.

7. A swollen battery in a portable computer can impinge on the trackpad from below and cause erratic behavior. If you have trouble clicking the trackpad, this is likely the reason. The battery must be replaced without delay.

8. There's a report that a (possibly defective) Thunderbolt Ethernet adapter can cause the built-in trackpad of a MacBook to  behave erratically. If you're using such an adapter, disconnect it and test.

9. There's also a report of erratic cursor movements caused by an external display that was connected but not turned on.

10. If none of the above applies, or if you have another reason to think that your computer is being remotely controlled, remove it from the network by turning off Wi-Fi (or your Wi-Fi access point), disconnecting from a Bluetooth network link, and unplugging the Ethernet cable or USB modem, whichever is applicable. If the cursor movements stop at once, you should suspect an intrusion.

11. Make a "Genius" appointment at an Apple Store to have the machine and/or external trackpad tested.

I've just finished a battle with this problem with my MacBook Pro. I've seen it before, and thought I was compromised, because I rebooted my modem and the problem went away. It was probably coincidence, because today, when I rebooted the modem, and even disconnected the computer from the network, the problem still occurred. I turned off Bluetooth, and it still occurred. I logged into a newly-created test account, and it still happened. I restarted several times, shut it down for a while, opened the back of the laptop and checked the battery for swelling (there was none). In desperation, I even reset the PRAM, which is almost as futile as sacrificing a chicken. No luck.

I finally booted into safe mode, and it stopped. I doubt that this was the cure, but when I rebooted into normal mode, the problem was gone.

Luckily, this doesn't happen often, but when it does, it's quite disrupting. I was working from home today, meaning that I was connected to my work computer via VPN, and I couldn't get anything done for the whole morning while I dealt with this. If it happens again soon, I'll take it in for service. Figures that my Applecare extended warranty expired two months ago.

For what it's worth, one more bit of strangeness that I observed: When it was acting up, if I dragged my finger over the trackpad, the pointer would respond to the touch in the upper third of the trackpad, stop responding in the middle third, and respond in the lower third. After the craziness stopped, the pointer would respond to touch everywhere.