Recently my window xp sp2 home takes forever to shutdown. It sits at the "windows is shutting down" screen for minutes even though the orange loading light on the processor doesnt flicker like it usually does. Its like windows feels like taking a rest temporarily before shutting down completely. I have been running jkdefrag frequently recently which could be the cause but i do not see how. jkdefrag has been flickering black dots on the main screen which i dont believe ive seen before, could it be disk errors? I have also recently installed macrium reflect, xilisoft video converter from GAOTD and many games with safari browser. Obvious ones are the video converter and macrium reflect since those type of programs dig into the OS with dlls and drivers. But i want to keep these giveaways so i hope there is a way of finding a specific culprit. Thanks.