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Windows System Registry
Almost all software installed on the PC will impact the System Registry. Preferences regarding hardware, options, and other software settings will all be added to the huge database of the Registry. Thus the System Registry isn't just the central nervous system for the Operating System (OS), it's the central nervous system for the OS and any applications installed to that OS.

What is a virus?
What is a virus? In today's computing environment, a better question might be, What is malware?

Boot sector viruses
To understand what a boot sector virus does, you must first understand what a boot record is.