Looking for entertainment? Windows 7 has a couple of tricks up its sleeve: media sharing and Windows Media Center. The latter is available in the ; only doesn't have it. Here's how to get more enjoyment out of your Windows entertainment apps.

Works in: 7 Wouldn't it be nice if Windows greeted you with a new wallpaper every time you start your PC? Or at regular intervals throughout the day? Windows 7 makes this so simple that you really have to wonder what took Microsoft so long.

To set your wallpaper options, press the Windows key, type background, and then click Change desktop background. By default Windows will show you its stock background art (and some lovely selections they are), but you can peruse different images (such as those in your Pictures Library) by clicking the Picture location drop-down or choosing Browse to pull from a specific folder on your hard drive.

Next, click Select All if you want to add all the displayed photos to your wallpaper rotation, or click the checkbox next to each individual photo you want to include. Then, click the Change picture every drop-down and set the desired interval (how often Windows will swap the current wallpaper for the next one on the roster) to 30 minutes, 1 day, or whatever. Finally, click Save changes.