I get following blue screen after running my laptop for an hour...

A problem has been detected and windows has been shut down to prevent damange to your computer. If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps:

Check to be sure you have adequate disk space. If a driver is identified in the stop message, disable the driver or check with the manufacturer for driver updates. Try changing video adapters.

Check with your hardware vendor for any BIOS updates. Disable BIOS memory options such as cashing or shadowing. If you need to use safe mode to remove or disable components, restart your computer, press F8 to select advanced startup options, and the select safe mode.

Technical Information: * STOP 0x0000008E (0xc0000005, 0x805B03F5, 0xF703DC7C, 0x00000000)

Beginning dump of physical memory Physical memory dump complete. Contact you system administrator or technical support group for further assistance.

so....

if this is a faulty memory....

from where I could buy RAM for following laptop....

TOSHIBA SATELLITE A45-S250

My local Frys store does not carry memory for this laptop.