I have a HP Presario 523n. My OS is Windows XP SERVICE pack 3. I have 1536 mb of memory. The computer has a1.80 AMD Athelon XP processor.
My problems are that the computer reboots itself at times, and is very slow most of the time.You need to provide more information about the exact problem (not the computer) and when and how the rebooting occurs.

For now, go to System PROPERTIES - Advanced - Startup & Recovery Settings and uncheck "automatically restart". Let's see if we can generate a blue screen error. If so, post the entire contents of that error screen here.Allan,
Thank you for the reply. I went in to system properties and unchecked the "start automatically".
The problem I'm having seems to be when I have to much running it reboots itself. There actually shouldn't be to much running but if you go to Task Manager it says that one process maybe using 95% of the CPU. It seems to operate most of the time with 100% of the CPU being used, making everything real slow and eventually rebooting the computer. And that process is.......? ? ?It doesn't have to be any one thing.  Just something running.Are you sure? Various processes will spike? What happened between the last time the system ran smoothly and the first time it did not (NEW hw, sw, virus, error, etc)?

For a start I suggest you run a full system scan with BOTH your av and MawareBytes.I can't think of anything new. I will do a system scan with av and malwarebytes and respond tomorrow. If a blue screen happens to pop up I will also leave content of it here. I thank you for all your HELPYOU're welcome, but so far I'm afraid I really haven't been any help.