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Some viruses are programmed to damage the computer by damaging programs, deleting files, or reformatting the hard disk. Others are not designed to do any damage, but simply replicate themselves and perhaps make their presence known by presenting text, video, or audio messages. Even these benign viruses can create problems for the [[User (computing)|computer user]]. They typically take up [[Computer storage|computer memory]] used by legitimate programs. As a result, they often cause erratic behavior and can result in system crashes. In addition, many viruses are [[Software bug|bug]]-ridden, and these bugs may lead to system crashes and [[data loss]].
'''hi'''''==History==
The Creeper virus was first detected on ARPANET, the forerunner of the Internet in the early 1970s.<ref>{{cite web |url=http://www.viruslist.com/en/viruses/encyclopedia?chapter=153310937 |title=Virus list |accessdate=2008-02-07 |format= |work= }}</ref> It propagated via the [[TOPS-20#TENEX|TENEX]] operating system and could make use of any connected modem to dial out to remote computers and infect them. It would display the message "I'M THE CREEPER : CATCH ME IF YOU CAN.". It is rumored{{Who|date=January 2008}} that the Reaper program, which appeared shortly after and sought out copies of the Creeper and deleted them, may have been written by the creator of the Creeper in a fit of regret.{{Or|date=January 2008}}
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