can u sue? EVE Online, in 2007, replaced many users Boot.ini file with one from their patch, and did exactly that - bricked tons of Windows PCs. Don't think they ever got sued for that.
https://community.eveonline.com/news...oot.ini-issue/
http://arstechnica.com/gaming/2007/1...etes-boot-ini/
http://www.youtube.com/watch?v=msXRFJ2ar_E
also, what exactly do you mean "let them into my system folder"? You realize every windows application auotomatically references dlls from the system folder? (See the PATH environment variable)