Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
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This Trojan when run modifies the Registry keys. The resulting effect of the Trojan running is the fact that Windows stays mostly non-functional: all icons on Desktop are removed, so it is not possible to reboot the machine in the usual way.
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