PC Expert

Avast
version: 7
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One of the best free anti-virus programs available. Helps keep your system safe from malicious viruses. Does require registration after 30 days, but remains free after that.
KeePass
version: 1.25
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The best place to store your list of passwords associated with websites, bank accounts or any other password you need to keep. Portable and secure.
Malware Bytes
version: 1.70
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Protects and removes malware from your system. This program is able to remove all traces of malware including worms, trojans, rootkits, spyware and other unwanted parasites.
Spybot: Search & Destroy
version: 2.0
DOWNLOAD HERE
A tool to scan and remove malware and rootkits from your PC. You can also protect your system by immunizing your browser and hosts file.
TrueCrypt
version: 7.1a
DOWNLOAD HERE
Creates a virtual encrypted disk within a file and can mount it as a disk. Able to encrypt entire partitions or storage drives. Completly secure and unhackable.