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I recently reinstall the OS in my Windows but it seems that the computer is slower than when I've just bought it new. I thought reinstalling OS would reset the computer to the initial speed. Are there any physical causes that can slow down computer?

I've seen the other questions like this but if possible I would like to have answers about only physical because I've already reinstall my OS.Thanks a lot.

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closed as too broad by Ƭᴇcʜιᴇ007, magicandre1981, Tog, Mokubai, Carl B Sep 29 '13 at 1:10

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

A bad HDD can introduce read errors and since Windows is always reading the disk, if those reads are slowed, Windows can appear slow. Most often its a software problem caused by a service, malicious process, or a bad driver. – Ramhound Sep 27 '13 at 17:43
Yes, there are, check out Does overheating cause a computer to slow down? for example, as well as Why does hardware get slower with time? – Ƭᴇcʜιᴇ007 Sep 27 '13 at 17:43
There's always a possibility of bad sectors on your hard drive slowing down read / write speeds. A stick of memory could also go bad and in turn slow down the system. I would suggest running some hardware diagnostics such at MemTest86+ for memory and MHDD for your hard drive, just to rule out any obvious defects! – Callen L Sep 27 '13 at 17:44
At my old computer I had, years ago, the cpu-clocking was saved in the built-in-battery on the motherboard. In my PC that battery was defect, so it couldn't safe the clocking of my cpu and the clocking was set to the lowest setting. But most of the time it's a HDD issue. – Christian Woerz Sep 27 '13 at 17:46

The most common reason computers slow down over time is that people use their computers differently than the way they used to, even if they don't realize it. For example, the resource consumption of a typical browser accessing a typical web page has quadrupled in the past three years. So doing "normal web browsing" is going to be slower because what constitutes "normal web browsing" has changed dramatically.

But there are definitely some hardware problems that can develop over time and slow a computer down. Most of them are associated with heat. Fans can fail, heat sinks can get clogged with dust, and thermal paste can dry out and crack.

Another problem is hard drive fragmentation. But a reinstall should have fixed that.

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Thanks a lot I will try to clean the heat sinks and replace the thermal paste. – G M Sep 28 '13 at 9:49

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