Ninety percent of these are Windows machines running the same applications, such as Word, Microsoft Exchange, and Excel. For the first time, we have a computing monoculture. Monocultures in the natural world are extremely vulnerable to pests, such as viruses. This is not because of any inherent design flaw in these operating systems, but rather because there are a growing number of these computers, and newer users of these operating systems tend to be less security minded. Allowing unrestricted file sharing or Windows scripts to be run makes your computer vulnerable to such attacks.
Many computers have permanent connections to the Internet.
If a malicious hacker discovers that your computer has a security hole, for example in Microsoft Outlook, then your IP address can be logged into a database. If another security hole is discovered in Outlook, then the malicious hacker can again attempt to compromise your computer, bypassing the need to scan the Internet for new targets. Malicious hackers may also trade these databases with one another, again bypassing the need to scan the Internet for targets. How to recover Today's Internet-based threats often damage critical computer files that can be difficult to repair or replace. Norton AntiVirus may not always be able to replace your computer's damaged Windows or program files.