Installing Drivers For Graphics And Wireless Network Card Drivers

Whenever i install drivers on my pc, (i've tried graphics card drivers and wireless network card drivers) my pc stops working. When i installed the graphics card drivers, i tried testing the graphics on a game (counter-strike) but as soon as i got into the game, the pc flashes a blue screen, and reboots. I cant see what the blue screen says because it flashes on and off again to quick for me to read it. I decided to uninstall the graphics card drivers, and the game worked perfectly, but the graphics were REALLY bad. So i thought i might need to update some other drivers, so i tried to install my wireless network card, but when i finished installing the drivers when i had to restart my computer, it flashed the BSOD.... AGAIN! I need help urgently as im going to a LAN gaming comp called "rezidue" and its on in 2 weeks, i need my pc fixed by then! All these problems started when i upgraded my CPU. Everything was running smooth, and i was happily playing along on my computer, when i was asked what my FPS was in counter-strike, and i was all "mine are 65!" and there like "wow that sucks, mines 130" so i set out on my epic quest to get better FPS then everyone else and MAN THAT WAS A MISTAKE. I upgraded from my celeron 2.8ghz cpu to a P4 3.0ghz HT cpu, and thats when things started messing up on me. My entire system is as follows (incase it can help someone help me) P4 3.0ghz HT CPU, Microstar P4 motherboard, 128mb Nvidia Geforce mx4000 AGP x8 graphics card, 256MB ddr ram (recently brought new 1GB ddr ram off ebay just for rezidue! should be here soon!) TP-LINK 54mbps wireless network card) And last but not least