Microsoft has made available its new "Fix it Center" software/online service combo today in Beta form which is primarily aimed toward users with limited knowledge in helping assist with identifying and resolving various issues in their Windows XP, Vista, 7 or Server operating systems.
The client is quite small at under 500kb and initiates with a scan of the system to diagnose and repair any issues resident. Upon completion of the scan you will be given the choice of what to repair and what to report with a log of every action performed being kept for your records to review at a later date if necessary.
Microsoft provide this free tool as a means to lessen common problems experienced and keep Windows installs safer and up-to-date.
The official homepage gives more information on how it works as well as providing the link for the client download.