An interesting problem in Vista

Hi everyone, my laptop has an problem in vista after a period of time not "using" it.
I am currently using Windows Vista Ultimate 32bit. It works fine in my laptop though the CPU is unlikely met the minimum requirement of Vista
However, things go strange after I leave the computer idle (what I mean idle is not using it, leave it turned on and go away) for say.... 2 or 3 hours, when I came back, the system runs really slow
I did check the taskmgr, there wasn't anything loading the CPU when I came back, so definitely not virus, but as soon as I use it, every single action will full load the whole CPU, even opening a folder will
This problem can be solved by re-logging in (not restarting but I can't be bother to do so and I really want to solve it.
Any ideas why is it like that?
P.s: The problem will not come out if I am using it for 2 or 3 hours (say... web surfing or playing games)

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