When I installed Windows 7 for the first time, I thought that everything would be okay. Unfortunately, I was very wrong and it turned out that I was missing some crucial drivers, including the usb drivers. As a result, I decided to download Driver Update Software and let it do its job. It turned out to be the right decision. The application found all the drivers that were missing and installed them within minutes. After that, the computer was not acting in a weird manner. So, in case you need to install some drivers on your computer, just let Driver Update Software do its thing.
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