My minecraft wont launch and i have treid just about everything?!

My minecraft wont launch and i have treid just about everything?!
Added (1). My Mc was working fine one day and the next day it wasnt! I had recently Increased the Javaw.exe and set the priority to high to make it run faster a Tip i had seen from youtube But that was the last time i played. I have reinstalled Java and it still doesn't work:( I had also gained a trojan virus but im pretty sure its removed. Could that have anything to do with it? When i double click it nothing apears at all And i cant even find the Javaw.exe program anymore in my task manager Please help

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