Need some good virus scanners, encryption, etc.

Encryption -> Truecrypt, Twofish




I used to have an awesome list, but I lost it :3
So if you know any kind of tool that can help keep you protect your computer, post it.


EDIT: I would also really like a free steganography program, if anyone knows of one.

EDIT:
Ok, here is our current list of tools!


Compression: - Makes files or folders smaller, much much smaller
KGB Archiver - Extremely powerful compressor, current best compressor. - Free
Universal Extractor - Can automatically detect most compression algorithms, and easily extract. - Free
7-zip - Cross platform and readily used (more powerful than winrar). - Free
winrar - The most common/standard Windows compression. - Free


Misc Tools: - Stuff that doesn't fit in elsewhere
File Cutter - Allows you to cut a file in to smaller parts (useful when using websites with max file upload, and such). - Free
Gmail Drive - Allows you to use your Gmail account as a virtual harddrive for remote storage. - Free
Revo uninstaller - An easier and faster way to uninstall programs on Windows.


File Recovery: - Programs that allow you to recover lost data
Recuva - Recovers deleted files.


Antivirus: - Used to protect, detect and remove all kinds of viruses
AVG free - Recommended - Free
Avast - Recommended - Free
Avira
kaspersky
ESET


Cleaning: - Used to delete temporary/personal data that can slow a computer down over time
Ccleaner - Recommended - Free
Tune up
ADDPC's temp file cleaner


Firewalls: - Prevent other machines from sending malicious data to your computer
Comodo - Recommended - Free
Zonealarm - Free
PC Tools Firewall Plus - Free
kerio personal firewall
peerblocker - Lets you explicitly control which machines your computer can communicate with on the internet (advanced)

Encryption: - Encode a file or folder so that it can only be accessed by you
Truecrypt - Free
Twofish - Recommended, currently unbreakable - Free
Toucan - Free


Virtualisation: - Runs programs in virtual environments, so they cannot harm your computer
Sand Boxie - Very easy to use, highly recommended - Free


Steganography: - Hides data within an image file, these are practically impossible to crack
-None-:[