computer randomly slowed down

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well i left my computer on yesterday in a rush and went out for the night, after returning this afternoon the computer is dramatically slower, barely being able to load up a video and music stuttering and start up taking way too long. so i did a system restore back to yesterday afternoon and still the same, you think this i hardware related? maybe memory failing or something?
 
Crystal ball is malfunctioning so could you tell what components you have (+OC or not) and have you recently installed any software...
 
c2d @ 3.6
gigabyte ds3
4x1 crucial ballistix
8800gt
corsair 520

temps are all normal, as i said i already went back to the last restore point and no luck
 
open up task manager and put in order of Cpu usage. is there anything using lots of CPU?

go into RUN, type msconfig, go to startup untick anything you dont need
 
First of all drop OC...
And use task manager to see if something is hogging CPU time. (processes, not applications)

System restore doesn't mean much, problem cause could have been installed long time ago but it surfaced only now.
 
well i left my computer on yesterday in a rush and went out for the night, after returning this afternoon the computer is dramatically slower, barely being able to load up a video and music stuttering and start up taking way too long. so i did a system restore back to yesterday afternoon and still the same, you think this i hardware related? maybe memory failing or something?
Long shot here but is your hard drive close to being full? Windows tends to use the page file even with a lot of memory and if windows update downloaded a load of updates while it was on then it could cause this.
 
First of all drop OC...
And use task manager to see if something is hogging CPU time. (processes, not applications)

System restore doesn't mean much, problem cause could have been installed long time ago but it surfaced only now.

it's a pretty new windows install, 2 weeks maybe

Long shot here but is your hard drive close to being full? Windows tends to use the page file even with a lot of memory and if windows update downloaded a load of updates while it was on then it could cause this.

yes my second hard drive with all my videos, musix etc is probably about 85%-90% full, looking at it now, it's the one slow at loading up, the other one is fine.

EDIT: the computer was downloading while i was out
 
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It isn't the drive with the page file I assume? If so then it shouldn't make any difference, though you could try clearing it up a bit or even a defrag.
 
well the videos play perfectly fine when i transfer them to the os's hdd, the one that's not nearly full like, defrag and disc clean up?
 
I don't see why it would cause your problem when the page file is on the primary drive but there is nothing to be lost by trying to free up some space and defragging it.

Another possibility is that the controller is throwing up errors (check the event viewer) from a dodgy or loose cable but you only left the computer on, you didn't move it!
 
I don't see why it would cause your problem when the page file is on the primary drive but there is nothing to be lost by trying to free up some space and defragging it.

Another possibility is that the controller is throwing up errors (check the event viewer) from a dodgy or loose cable but you only left the computer on, you didn't move it!

yea well i'll defrag tomorrow, i'll maybe try moving stuff onto external drive to free some space. seems weird, maybe check for disc errors or bad sectors and stuff, maybe drive is dodgy?
 
maybe drive is dodgy?
I wouldn't have thought so, you could run the manufacturer diagnostic tool on it to make sure but drives don't usually do that (more like bad sectors, metallic "ticking" and so on).
 
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