The following are free open-source options for Antivirus protection:
These sources offer free versions of their Antivirus and Anti-spyware tools:
http://www.comodo.com/– Comodo offers a variety of free security tools such as personal firewalls, antivirus and anti-spam products.
http://free.avg.com/ – AVG offers a free antivirus and anti-spyware package.
http://www.javacoolsoftware.com/spywareblaster.html– SpyBlaster application prevents installation of spyware.
Vulnerability scanners can be used to search for and map systems for security weaknesses in applications, computers or on a network. Here are two free scanners:
Microsoft Baseline Security Analyzer (MBSA) helps small- and medium-sized businesses who use Microsoft products detect common security misconfigurations and missing security updates on their systems.
Tenable Network Security offers free downloads of the Nessus® vulnerability scanner, which can be used in detecting security weaknesses through a variety of configuration auditing, sensitive data discovery and vulnerability analysis tools. Subscriptions are required to obtain support, updates to the database of vulnerability checks and compliance auditing.
Resources for encryption of stored data:
EFS – The Encrypted File System has been available on professional versions of Microsoft Windows since Windows 2000. EFS allows file level encryption of sensitive files. Additionally, Microsoft BitLocker Drive Encryption is available on Microsoft Windows XP and Vista. With BitLocker, all data on a PC can be encrypted, preventing unauthorized users from being able to circumvent operating system passwords and access data.
The following link is to a “Data Encryption Toolkit for Mobile PCs,” which is provided by Microsoft. This toolkit provides guidance and software tools needed to effectively use both EFS and BitLocker for encryption of sensitive data.