need help with computer problems

hi, i need some help, couse my computer has a problem, it happens that when im about to play gta sa i sometimes get bluescreen and sometimes the screen go black and i have to press ctrl-alt-del and close it (i cant play it couse one of those is allways happening) , then my screen go blurry and shit, also when i try to watch a movie in VLC media player then i get audio but no video.. ive reinnstalled my graphics driver and directx but nothing helps. Ive also runned a virus scan, but i dont think it is a virus. and i also runned ccleaner, nothing there neither, so i dont know what else could be causing this problem, if anyone has a clue bout whats going on, then please help me, couse i dont wanna reinstall my computer since i will loose everything or have to burn out like 50 backup discs..

help is appretiated alot

plejmo

help: reinstall windows
And never put anything in the drive where you've installed your windows

or you can check your ram, or your graphic card's plug to make sure its fitted properly

that vlc thingy is cuz of insufficient codecs maybe

umh, it worked nicely until yesterday, so its not codecs, and its a laptop, everything is ok when it comes to harware.. but thanks for the tip anyway..

first,some videos downloaded of youtube,maybe the format not is the correct and is for this that you listent but not see nothing,and with gta sa,the blue or black screen is usuly in vista,its a shit in vista,sometimes the game no run and not acept the mouse,gta sa in vista is the worse option in the world,this is what i think,my opinion.solution.
maybe,you don't need install windows,you need xp and download videos in other format.example:its happen with me before.

Agree with Varinder, reinstall windows...

ive watched the movie before, it isnt that, and no i cant use xp couse then i want get the drivers i need.. and i didnt ask how many thought i should reinstall windows, i asked for help to solve the problem..

welll,one time i downloaded the video of youtube and i watched it one time,and after,it happen with me too.