Q: why every time i log onto the internet and be on for a few sec a box come up saying to shut you laptop down and restart

This document should provide the information you need to diagnose and fix Kernal Panics:

http://support.apple.com/kb/TS3742

The recurring Kernal Panic problem is not going to just magically go away because you posted a question here in Apple Support Communities.

YOU have to do things to help diagnose and fix it.

Did you try a 'Safe Boot' http://support.apple.com/kb/HT1564?viewlocale=en_US

Starting up in Safe Mode

To start up into Safe Mode (to Safe Boot), follow these steps.

1. Be sure your Mac is shut down.
2. Press the power button.
3. Immediately after you hear the startup tone, hold the Shift key.
   The Shift key should be held as soon as possible after the startup tone, but not before the tone.
4. Release the Shift key when you see the gray Apple logo and the progress indicator (looks like a spinning gear).

After the logo appears, you should see a progress bar during startup. This indicates that your computer is performing a directory check as part of Safe Mode.

To leave Safe Mode, restart your computer without holding any keys during startup.

From original the Kernal Panic troubleshooting link:

For OS X Lion and earlier, follow these steps:

1. Press and hold the Power button for several seconds to turn off your Mac.
2. Turn on your Mac.
3. As soon as your Mac starts up, hold down the Shift key to start up with a Safe Boot into Safe Mode. Note: If you are using a third-party external keyboard and cannot start with a Safe Boot, try using an Apple keyboard instead.
4. If your Mac has another kernel panic starting up, or while in Safe Mode, go to the "Troubleshooting a recurring kernel panic" section below.
5. If your Mac starts up without a kernel panic after a Safe Boot, restart by choosing Apple menu () > Restart…, then let it start up normally.
   

Important: If the Mac has another kernel panic within a few weeks, refer to the "Troubleshooting a recurring kernel panic" section below.

Note: If the hardware and software on the Mac checks out as OK, yet recurring kernel panics still occur, it is possible that something on the network is sending the Mac malformed network packets. In these situations, check the devices on the network. Make sure the router's firmware is up-to-date, and that the router is functioning. Refer to the router's manufacturer for service and support.

Message was edited by: kostby

Then on to the next part of the process outlined in the original link...

Troubleshooting a recurring kernel panic

Diagnosing a recurring kernel panic can be difficult. If you would like to avoid this process, or do not know how to perform any of the following steps, consider bringing the Mac to a Genius at an Apple Store or an Apple Authorized Service Provider for assistance. Be sure to ask that, if the drive needs reformatting or replacing, they contact you about escalating your case to a special data recovery service. If you plan to visit an Apple Retail store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).

Tip: To help diagnose recurring kernel panics, record the date and time it occurs, and any information that appears with the kernel panic message.

• Was the computer starting up, shutting down, or performing a particular task when the recurring kernel panic happened?
• Is the kernel panic intermittent, or does it happen every time you do a certain thing?
• Does it occur only when a certain external device is connected, or a device is connected to a certain port?

Isolate hardware or software as the cause of the kernel panic

1. Start the Mac from Recovery or its install media. Note: If a kernel panic still occurs, go to the "Hardware troubleshooting" section of this article.
2. Open Disk Utility and use "Repair Disk" on Mac's internal hard drive (named Macintosh HD by default).
   
   Important: If Disk Utility is unable to repair the internal drive, you should bring the Mac to a Genius at an Apple Store, or an Apple Authorized Service Provider for service and support. Be sure to ask that, if the drive needs reformatting or replacing, they contact you about escalating your case to a special data recovery service. If you plan to visit an Apple Retail store, make a reservation at the Genius Bar usinghttp://www.apple.com/retail/geniusbar/ (available in some countries only).
3. Connect an external drive with at least 10 GB of free space. Note: Make sure the external drive does not cause kernel panics and is the only device on its USB, FireWire, or Thunderbolt port. Connecting the external drive and its cables to another Mac can help make sure the drive does not cause kernel panics.
4. Install OS X on the external drive.
5. Start up from the external drive.
6. Install all software updates until Software Update reports your software is up to date.
7. Use the Apple applications on the external drive to surf the web, view QuickTime movies, email, print, scan, and/or other activities. Continue using the Mac for the amount of time it would usually take for the kernel panic to occur.
8. If a panic occurs, go to the "Hardware troubleshooting" section of this article to further diagnose the issue.
   If a panic does not occur, go to the "Software troubleshooting" section of this article to further diagnose the issue.

And if extensive troubleshooting is beyond your level of expertise, take it to an authorized repair facility, as suggested.