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2. AOL Tech Fortress | 30-Day Free* Trial | AOL Products

   www.aol.com/products/security/tech-fortress

   Windows: Microsoft Windows 7 SP1 or later. 1GB RAM and 100 megabytes of free hard disk space, 1.80 GHz or faster 2 cores and x86/x64 compatible architectures. One PC per purchase. One PC per purchase.

3. System Mechanic Software | 30-Day Free* Trial | AOL Products

   www.aol.com/products/utilities/system-mechanic

   Download System Mechanic to help repair and speed up your slow PC. Try it free* for 30 days now. AOL.com. ... System Mechanic is an easy solution for optimal PC performance and simple computing ...

4. Norton Security Online | 30-Day Free* Trial | AOL Products

   www.aol.com/products/security/norton-online

   Help protect your devices with Norton™ Security Online. Real-time protection against viruses, malware, spyware and cyber threats. Try it free* now!

5. Avast Antivirus - Wikipedia

   en.wikipedia.org/wiki/Avast_Antivirus

   Avast Antivirus is a family of cross-platform internet security applications developed by Avast for Microsoft Windows, macOS, Android, and iOS. Avast offers free and paid products that provide computer security , browser security , antivirus software , firewall , anti-phishing , antispyware, and anti-spam , among other services.

6. Comparison of antivirus software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_antivirus...

   Many antivirus products use "third-party antivirus engine". This means that the antivirus engine is made by another producer; however, the malware signature and/or other parts of the product may (or may not) be done from the owner of the product itself.

7. Characteristic velocity - Wikipedia

   en.wikipedia.org/wiki/Characteristic_velocity

   Characteristic velocity or , or C-star is a measure of the combustion performance of a rocket engine independent of nozzle performance, and is used to compare different propellants and propulsion systems. c* should not be confused with c, which is the effective exhaust velocity related to the specific impulse by: =. Specific impulse and ...