Both at work and in my personal life, I am often asked to optimize PCs, so I have decidced to create a page exclusively detailing the most common things I do and providing download links for the tools I use most.

Cleanit - Safely clears the temporary files off your system at reboot.
AVG Antivirus - 100% free antivirus, as good or better than the competition.
AVG Antivirus 64Bit - 100% free antivirus, as good or better than the competition.
Primo PDF - Great free PDF printer.
Irfanview - Simply the single best graphic viewing application out there.
Defrag - A small command line program that completely defragments a drive.
Boot Optimizer - A script to optimize boot-up files.
Temp File Cleanup - Scours your PC for ALL temporary files and deletes them.
Full Defragment - Runs newer windows built in defrag for full disk optimization.