Free tools to remove viruses, malware & spyware
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AdwCleaner is a tool that deletes Adware/Toolbar/PUP/Hijacker
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ESET Online Virus Scanner
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Malwarebytes removes worms, trojans, rootkits, rogues, dialers, spyware and more
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Microsoft Safety Scanner removes virusus, spyware, and other malicious software
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RogueKiller removes generic malwares and some advanced threats such as rootkits, rogues, worms
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HouseCall can fix a wide range of threats including viruses, worms, trojans, and spyware
Backup
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Robocopy is a great command line utility and included with Windows.
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Handy Backup is my favorite inexpensive backup tool for everyday protection.
Passwords
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Ever wonder how secure are your passwords? You can check them at howsecureismypassword.net.
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KeePass is a great utility for securely storing all of your passwords.
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Secure password generator from pctools by Symantec.