That right there my friend, That would be a detonation virus. It goes into your system, damages lots of stuff without you knowing, then finds the most used program in your computer, goes into the central processor of the program and 'detonates' thus the name and thus completely erasing that program. Simple. (Also yeah, you wont be able to redownload or anything your gonna have to buy it again. Oh and one thing, keep your firewall up so this doesnt happen again.)
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