Not sure whats going on. Last night I gave my pc a quick clean out with an air duster after which it was running fine last night. Today its behaving strangely, I noticed things which loaded up super fast before are now struggling and taking ages, if i load any of my games not only do they take an age to cache etc, but they are 2-5 fps slideshows. Thought it may have been a bit of dust lodged in a port, removed RAM sticks and GFX card air dusted and replaced. Switched the ram sticks in the process. Now that knocked out my sound for some reason. What to do?