Unlocker
– Unlocks files/folders that are in use.
CCleaner
– Scan/fix registry issues, cleans out temporary files.
Autoruns – Lets you view and change items that load on your computer or run on startup.
Mozilla Firefox
– Simply the best web browser, ever.
Firefox must-haves:
Adblock Plus
– Allows you to block annoying / deceptive ads.
Adblock Plus Element Hiding Helper
– Extends Adblock Plus and allows finer control over what you can block.
NoScript
– Blocks all JavaScript unless you decide to allow it. Stops many annoying web issues. I recommend putting this in blacklist mode (it defaults to whitelist mode).