An interesting problem in Vista

[rosy0123]

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)

[F.E.A.R.]

have you disabled superfetch? superfatch can highly lower your system performance over time.

[RoadStar]

What i would do is after logging in, and eveything is running good, run MSCONFIG, trim your start up as much as possible. Reboot, then run Spybot and your AV. After that, run hijackthis and root out anything else that shouldn`t be there.

As far as super prefetch, in my opinion if the system is set up right, and provided you have enough RAM, at the very least 1GIG for Vista, if anything it will enhance performance, if in doubt, disable it.

[EzyStvy]

Turining off the sleep/hibernation would help...