Basic Features Suddenly Customized Or Uninstalled

I have a netbook running Windows 7 Starter, and then all of a sudden some features/devices were disabled, or I don't know...uninstalled?There's a distinct look for the Windows 7 taskbar, right? Well, when I turned the computer on, this was what the taskbar looked like:

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It began looking like Windows XP or something. I tried checking the Color Management Settings but all it did was change the color, not the theme (you know, that circle start button)But the Start Menu was the same Windows 7 Menu, only that it had a different theme:

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The windows looked like this instead of the smooth and semi-transparent window look in Win 7:

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What surprised me was that the Audio was somehow disabled...or uninstalled...When I tried right clicking that audio icon in the taskbar, it asked me to install an audio device, since it was detecting some sort of problem in the audio:

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I thought those were the only things that changed, so I went on with my work. But when I opened a spreadsheet in Windows Excel and tried to Print Preview, it gave me this:

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I wish I could tell you more details about it, but I just can't describe what happened. I don't even know what happened...maybe I tweaked the computer settings by accident and then made the changes after it rebooted. And by the way, the network settings were also somewhat configured, says I'm not connected to anything (well in fact I have a fully functional broadband radio connected).