My computer is an old sony with a Windows 98 operating system. It has served my purposes quite nicely, but lately the internet will freeze if I say try an exit facebook or click on a link using on a yahoo site. Some more things about my computer that my be useful is it ticks like a clock for a few minutes at least once a day. It has also started a high pitch whin 24-7 which previously I could only hear when I was on the computer and now I can hear it across the room. These maybe nothing and probably are, but I know the more information the better. I use internet explorer, I do not know which one but it is probably the last one that my system supported. Also one more thing. I believe I have installed the latest version of Yahoo messenger (once again I have no idea which version I actually have or how to check that). Is my system able to support the plug-ins and if so how do I add them?