It is very common for WIndows OS to become sluggishly after some time, but when it reaches the point where you can’t get anything to run properly, you know that it is time to do a re-installation. For my Windows 7 machine, after countless installation/uninstallation of various applications (all for testing purpose), it starts to give way and behaves abnormally. Apps start to run sluggishly and I can’t even get the Windows update to function. The best choice for me is to reinstall the OS.

However, most people don’t like (or even hate) to do a reinstallation because it means that they have to reformat the hard drive and probably lost some of their precious data. The fact is, you don’t really have to reformat your hard drive to reinstall the OS. Even after the reinstallation, your data will still be intact. Here’s how you can do it:
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