Upgraded my laptop from 256mb to 512mb and keeps crashing

Hi, i have recently brought memory of 512mb SDRAM - SODIMM for my laptop which is a straight replacement for old memory, the only thing is that evertime i start my laptop after between 5 - 30 seconds the damn thing flashes a blue screen with writing on and restarts, im getting pretty f**ked off with it, any1 got ne ideas?

 

Any Beeps?

 

nope, just turns on starts up fine, so i sign on my name and it gets to the end of like starting all prog up, like msn, network connections ect, then goes to the blue screen

 

old ram, which im on at the moment, works fine, tried reseating and still doesnt work damn thing, cost me £75 as well, ne ideas welcolm

 

also, if i go into safe mode new ram works and is reconised by the computer but still nothing in normal windows

 

only 1, only 1 slot for upgrading

 

memory testor?

 

yep thats right

 

so ne ideas

 

ok, will i have to put new memory in first and start in safe mode?

 

Right, i have found out i have a few errors using the program recommended, (a few = 1,400,000), how can i put them right?

 

dont no, just 1 digit wrong, and only on two tests, outta 9, i also downloaded windows mem tester, and that also found the errors, but dont tell ya how to fix it, ive gone back to using me 256mb for now, also wiped hdd and reinstalled windows using new memory and still crashes