I required Toshiba Satellite 1805-S274 video graphic driver

Have you checked here: http://support.toshiba.com/drivers Which OS do you need the VGA (Graphics) driver for ?

Surf to the Toshiba manufactures website and enter your model number so you can pull up your drivers and BIOS updates. Toshiba Laptops often require more BIOS updates than the avg laptop.
http://support.toshiba.com/

You can find the user manual here, which might have hard drive replacement instructions in it:

http://www.fixya.com/support/p265825-toshiba_satellite_1805_s274_pc_notebook/manual-14789#

Two separate problems, sounded like..

White screen? If external video is okay then it's likely (1) a bad screen, or (2) a disconnected video cable.

If the system shuts down, I'd check the fan - if the fan is reasonably clean and running, then it's probably a bad motherboard.

I want driver VGA for XP of Toshiba 1805 S274

Try download the full drivers package on zip from
http://www.xpvistasite.com/satellite_1800_s274_47643.htm

Hello, do you know the grafics card that you have on your Toshiba? Brand, model...? Regards

Yes.

look on back of laptop you will see some panels under panels you will see two little wires connected to mother board that's the cmos battery unplug it and change it

Hello Ewuare,
Here is a link to Toshiba's Satellite Support Downloads page: http://www.csd.toshiba.com/cgi-bin/tais/su/su_sc_modSel.jsp. I couldn't locate the model number you posted above there, so you may want to double check it. You can find updated Graphics card drivers for your machine there.
Good luck.