From Microsoft site:
What it fixes...
Problems with desktop shortcuts and icons
Shortcuts on the desktop don't work or are broken
Desktop icons are broken or have not been used in 3 months
Startup items don't work or are broken
System maintenance tasks
Free up disk space by repairing disk volume errors such as bad sectors, lost clusters, cross-linked files and directory errors
Free up disk space by removing error reports and troubleshooting history older than 1 month
Set the correct system time and synchronize system clock with the time server
You receive the following errors:
Windows update error 0x80072F8F
The item that this shortcut refers to has been deleted
