I have a Toshiba Satellite A305-s6864. after i play a game on my computer, i shut it off and when i turn it back on, i go on my account and all the colors on my screen just mix up and you dont even understand whats on my screen. it also frezes when the screen gets mixed up.

I would start by entering the bios using the method below. Try running a hardware scan. It sounds like you could just have a hard drive that is going bad.
F2 key method Turn the computer on. If you see an invitation to press the F2 key to enter Setup, do so. The Setup screen will appear.
Toshiba Hardware utility method Run the Toshiba Hardware utility from the Toshiba Console. It may also accessible (as 'HWSetup') from the Windows Control Panel. Changes to some of the settings will require re-starting the computer. This method is the only way to access the BIOS settings on some notebook PCs (Satellite 5000 series, for example). (For these machines, pressing and holding the F12 key immediately after powering-on the notebook will allow you to alter the notebook's boot priority.)

If the Toshiba Hardware utility is not present, try the F2 key method and the Esc key method (see below). The Toshiba Hardware utility may be downloaded from the Toshiba support website at http://support.toshiba.com
If the computer is fully off, and/or to avoid having to re-start it (and Windows), use one or the other of the following two methods. The PC will have to be truly off (not suspended, or in standby mode, or in hibernation mode). If an external keyboard is attached to the notebook (either directly or via a docking station or a port-replicator), disconnect it until you have completed this procedure.
Esc key method Turn the computer on. If you do not see a prompt to press the F2 key, then immediately press and hold the Esc key for three seconds, and then release it. When prompted to, press the F1 key. The Setup screen will appear.
For Toshiba notebook PCs manufactured before the introduction of Windows XP One or more of the following methods are appropriate:
HWSetup method Run the HWSetup utility from the Windows Control Panel. This utility provides a relatively user-friendly way to change the BIOS settings. Changes to some of the settings will require re-starting the PC (and Windows). HWSetup was pre-installed on all but early Toshiba notebook models. If it doesn't appear as a Control Panel applet on your computer, you may be able to download it from the Toshiba Support website as part of the Toshiba Utilities package for your model.
Esc key method If an external keyboard is attached to the notebook, either directly or via a docking station or a port-replicator, disconnect it. Turn the computer on. Immediately press and hold the Esc key for three seconds, and then release it. When prompted to, press the F1 key. The Setup screen will appear. The PC will have to be truly off (not suspended, or in standby mode, or in hibernation mode) for this method to work.
http://support.toshiba.com/sscontent?docId=98081013

try going into the bios and change the boot priority to cd first then hdd, you may also have to set the jumper on the hdd to master.

you do have something else running in the background and its using the internet, probably spyware or malware. run your anti-spyware program and check, if you don't have one, you need to try "malwarebytes" or "spybot" they are free programs

Problem description: The laptop shuts off when AC power adapter is plugged in. The laptop works fine on battery power but as soon as you connect it to AC adapter, the laptop turns off.
Possible cause: 1. Power adapter failure.
2. Motherboard failure.
Possible troubleshooting steps and repair solution: First of all, test the power adapter. Make sure the adapter outputs correct voltage. It's possible that the output voltage is not correct and the laptop shuts down to prevent the damage. Test your laptop with another known good power adapter.
Toshiba Satellite A305 AC Adapter
If the problem still exists, even after replacing the adapter, most likely it's the motherboard failure. Replace the motherboard.

1. check the power adapter with power metter
2.check the laptop with othter adapter

Toshiba Satellite's are not game machines. Just put up with the error, or get a desktop.

reboot the computer and restart it in safe mode by pressing F8.select administartor account and then go to control panel -user accounts and then u remove the password.restart the computer again and then put in a passwrd again if u want

no problem, glad it worked

No problem,

Yea, it should be the latest driver for your specific card

The Radeon 3400 series is the one you're looking for.