This may seem stupid, but I've always shut my pc off at the end of the day. I've decided to try leaving in running non-stop, and was curious about a few things. First off, which OS would be the safest from attacks? I have SUSE Linux 9.1, and Windows XP Pro installed. I am behind a hardware firewall, and keep the Windows side of things pretty tight (in the last 6 months I've gotten no spyware detected in adaware 6.0, or spybot S&D). I run antivirus software as well, and have never picked up a virus. Am I equally safe with either OS? Next is performance. Are there any performance hits from leaving a system running 24/7?