Hardware devices are not working or are definitely not detected in Windows Immediately diagnose and fix problems with hardware. (USB) Mice and keyboards usually are not detected by the machine manager or when they aren’t working.
Diagnose and fix sound recording and problems immediately Diagnose and repair good and audio problems on your desktop when your computer does not record sound, as well as the audio device is disabled or turned off.
Diagnose and fix sound playback in addition to audio problems automatically Instantly diagnose and repair reactions to your computer sound plus audio playback device when your pc does not play noise or sound is muted.
Fix the problem with Microsoft Windows Update that is not working Automatically diagnose and repair Windows Update issues that Windows Update doesn’t work or fails because Windows Update is broken or disabled.
Fix problems with programs that can’t become installed or uninstalled Auto-magically repair program installation challenges that installing or removing program fails on account of corrupted registry keys and also blocked installation.
FIX: Zune, Zune HD players or Windows Phone 7 can’t connect to PC Automatically fix the connection problem that your computer does not recognize or detect Windows Phone 7, Zune or Zune HD devices when connected to pc.
Diagnose and fix printer and printing problems automatically Immediately fix printing issues like printer doesn’t work, struggling to install printer, cannot go to a network printer and also other printing errors.
Fix problems with CD or DVD drives can’t read or perhaps write media Diagnose along with repair CD or DVD AND BLU-RAY drive issues, if you cannot burn or have fun with CD or DVD back, if a drive is not observed, not really accessible or not coupled.
more info http://support.microsoft.com/fixit