Damn dude we've already made it as easy as we can for you. We gave you pictures, we had numerous people give different explanations (all of which would work) yet you still don't get it. If you cannot apply a little tube of silver substance to a flat surface, at the age of?... then you seriously should re-consider your weekend hobbies. How you managed to waste an ENTIRE can of compressed air is beyond me, I have a 10oz can of the stuff right beside me and its lasted months, and I use it regularly on my printer, my stereo, and my DSL modem (cat likes to wander around the computer desk) You probably screwed something up by spraying the COLD and WET LIQUID co2 onto your computer. Just give up, seriously. Take whats left of your laptop to the local computer store, get them to repair it, lock the BIOS for you, and let you carry on with your life. Sorry if this sounds harsh, but I find it unreal how somebody can be so stupid and thick-headed.
~Bryan~