Microsoft Windows updates
*Start menu > Control Panel > Windows Updates or Automatic Updates
Run your windows disc clean up.
*Start menu > Programs > Accessories > System Tools > Disc
Clean up
Remove old and unused programs with the ADD/REMOVE program installed
with Windows
*Start menu > Control Panel > Add or Remove Programs
Defragging your Hard Drive with the Defrag tool installed with
Windows
*My Computer > Right mouse-click on HDD Letter (C:) > Properties > Tools > Defragment
Advanced maintanence includes:
Install a firewall for your computer, software or hardware.
Updating Antivirus regularly
(AUTO reccomended)
Scanning for Adware/Spyware regularly with updates
Deleting old email and attachments regularly
Suggestions on what you can do to secure/clean your PC. Every attempt
has been made to be general and an assumption of a "Windows" operating
system is made here as well - although in some ways, this could
be
adapted to any OS.