I have a Presario 18XL590 that I just freshly installed with Win XPP. I am having a weird problem that I can't figure out. The machine seems to fail to complete tasks - like opening programs. It is almost like the machine is busy but when I check task manager it doesn't appear that anything is running interference. When I click to open a program, I get an hourglass for a second or two and then it disappears but the program doesn't open. The system doesn't appear to freeze or lock up because I can still get some things to function (like the program list appearing from the start button) but nothing will open. Then, after several minutes, all of a sudden everything I tried to open previously opens with rapid succession. I don't get any video flashing or flickering, the machine doesn't appear to be unusually hot, and when it is not "stuck", software functions normally. I don't know where to begin. I have checked the logs and there are a few hints of problems, but nothing obvious. Could this be a processor problem and if so, is there a definitive way to diagnose it? This problem was occuring before I reformated the drive.