Hi, I have an nVidia GT540M on my laptop, and when I first got it my games used to run perfectly. Then after about a year or so, every game I had started lagging. I couldn't even run Minecraft on max graphics smoothly. Not only that, but before, my laptop wouldn't get very hot while I was just browsing the web. But now it starts heating up when I'm on the desktop. And also, my laptop is really loud nowadays. What is the problem?
also try cleaning up your system software wise...get rid of the junk that may have accumulated and run ccleaner disk defrag and disk cleanup..while your at it run an antivirus scan and then install the latest drivers from nvidia on top of what kylekillzone said